diff --git a/src/main/java/com/devsu/push/sender/service/async/AsyncAndroidPushService.java b/src/main/java/com/devsu/push/sender/service/async/AsyncAndroidPushService.java
index be0708d..1d34790 100644
--- a/src/main/java/com/devsu/push/sender/service/async/AsyncAndroidPushService.java
+++ b/src/main/java/com/devsu/push/sender/service/async/AsyncAndroidPushService.java
@@ -15,7 +15,8 @@ public class AsyncAndroidPushService extends AsyncPushServiceBase {
 	private static final String BUILDER_OBJECT = Message.Builder.class.getSimpleName();
 	
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncAndroidPushService#AndroidPushService(String)
+	 * Single param constructor.
+	 * @param gcmApiKey The GCM API Key (also known as Sender ID).
 	 */
 	public AsyncAndroidPushService(String gcmApiKey){
 		super(new SyncAndroidPushService(gcmApiKey), null);
@@ -34,8 +35,6 @@ public AsyncAndroidPushService(String gcmApiKey, PushCallback pushCallback) {
 	 * Sends a single push message.
 	 * @param msgBuilder The Message.Builder object.
 	 * @param token The push token.
-	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
 	 */
 	public void sendPush(final Message.Builder msgBuilder, final String token) {
 		ExecutorService executorService = Executors.newSingleThreadExecutor();
@@ -61,9 +60,7 @@ public void run() {
 	/**
 	 * Sends a bulk push message.
 	 * @param msgBuilder The Message.Builder object.
-	 * @param token The push token.
-	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @param tokens The push tokens.
 	 */
 	public void sendPushInBulk(final Message.Builder msgBuilder, final String... tokens) {
 		ExecutorService executorService = Executors.newSingleThreadExecutor();
@@ -87,56 +84,66 @@ public void run() {
 	}
 	
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncAndroidPushService#setMaxRetries(int)
+	 * Sets the number of max retries when sending a push message.
+	 * @param maxRetries The number of max retries when sending a push message.
 	 */
 	public void setMaxRetries(int maxRetries) {
 		((SyncAndroidPushService)pushService).setMaxRetries(maxRetries);
 	}
 
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncAndroidPushService#setMessageKey(java.lang.String)
+	 * Sets the message key that will store the key-value pair for the push message content.
+	 * @param messageKey The message key that will store the key-value pair for the push message content.
 	 */
 	public void setMessageKey(String messageKey) {
 		((SyncAndroidPushService)pushService).setMessageKey(messageKey);
 	}
 
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncAndroidPushService#setTitleKey(java.lang.String)
+	 * Sets the title key that will store the key-value pair for the push message title.
+	 * @param titleKey The title key that will store the key-value pair for the push message title.
 	 */
 	public void setTitleKey(String titleKey) {
 		((SyncAndroidPushService)pushService).setTitleKey(titleKey);
 	}
 
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncAndroidPushService#setMaxBulkSize(int)
+	 * Sets the quantity of push messages to be sent simultaneously on multicast requests. 
+	 * <b>NOTE:</b> As of December 2016, GCM states that there's a max limit of 1.000 simultaneous
+	 * registration ids on multicast requests. See the <i>registration_ids</i> parameter <a href="https://developers.google.com/cloud-messaging/http-server-ref">here</a>.
+	 * @param maxBulkSize The quantity of push messages to be sent simultaneously on multicast requests. Has a max value of 1000.
 	 */
 	public void setMaxBulkSize(int maxBulkSize) {
 		((SyncAndroidPushService)pushService).setMaxBulkSize(maxBulkSize);
 	}
 
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncAndroidPushService#setCollapseKeySingle(java.lang.String)
+	 * Sets the collapse key for identifying single messages.
+	 * @param collapseKeySingle The collapse key for identifying single messages.
 	 */
 	public void setCollapseKeySingle(String collapseKeySingle) {
 		((SyncAndroidPushService)pushService).setCollapseKeySingle(collapseKeySingle);
 	}
 	
-	/**	 
-	 * @see com.devsu.push.sender.service.sync.SyncAndroidPushService#setCollapseKeyBulk(java.lang.String)
+	/**
+	 * Sets the collapse key for identifying bulk messages.
+	 * @param collapseKeyBulk The collapse key for identifying bulk messages.
 	 */
 	public void setCollapseKeyBulk(String collapseKeyBulk) {
 		((SyncAndroidPushService)pushService).setCollapseKeyBulk(collapseKeyBulk);
 	}
 
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncAndroidPushService#setGcmApiKey(java.lang.String)
+	 * Sets the GCM API Key (also known as Sender ID).
+	 * @param gcmApiKey The GCM API Key (also known as Sender ID).
 	 */
 	public void setGcmApiKey(String gcmApiKey) {
 		((SyncAndroidPushService)pushService).setGcmApiKey(gcmApiKey);
 	}
 	
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncPushServiceBase#setPushEnabled(boolean)
+	 * Enables/disables this service.
+	 * @param pushEnabled The parameter that enables/disables this service.
 	 */
 	public void setPushEnabled(boolean pushEnabled) {
 		((SyncAndroidPushService)pushService).setPushEnabled(pushEnabled);
diff --git a/src/main/java/com/devsu/push/sender/service/async/AsyncApplePushService.java b/src/main/java/com/devsu/push/sender/service/async/AsyncApplePushService.java
index 7ff572e..0929c80 100644
--- a/src/main/java/com/devsu/push/sender/service/async/AsyncApplePushService.java
+++ b/src/main/java/com/devsu/push/sender/service/async/AsyncApplePushService.java
@@ -19,7 +19,12 @@ public class AsyncApplePushService extends AsyncPushServiceBase {
 	private static final String BUILDER_OBJECT = PayloadBuilder.class.getSimpleName();
 
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncApplePushService#ApplePushService(String, String, boolean)
+	 * 3 param constructor.
+	 * @param certificatePath The path of the p12 certificate file.
+	 * @param certificatePassword The password for the p12 certificate.
+	 * @param useProductionServer Indicates if the services uses a Production environment or a Sandbox environment.
+	 * @throws RuntimeIOException An IO exception.
+	 * @throws InvalidSSLConfig Certificates are corrupted, wrong or password is wrong.
 	 */
 	public AsyncApplePushService(String certificatePath, String certificatePassword, boolean useProductionServer)
 			throws RuntimeIOException, InvalidSSLConfig {
@@ -32,8 +37,8 @@ public AsyncApplePushService(String certificatePath, String certificatePassword,
 	 * @param certificatePassword The password for the p12 certificate.
 	 * @param useProductionServer Indicates if the services uses a Production environment or a Sandbox environment.
 	 * @param pushCallback The push callback.
-	 * @throws RuntimeIOException
-	 * @throws InvalidSSLConfig
+	 * @throws RuntimeIOException An IO exception.
+	 * @throws InvalidSSLConfig Certificates are corrupted, wrong or password is wrong.
 	 */
 	public AsyncApplePushService(String certificatePath, String certificatePassword, boolean useProductionServer, PushCallback pushCallback) 
 			throws RuntimeIOException, InvalidSSLConfig {
@@ -44,8 +49,6 @@ public AsyncApplePushService(String certificatePath, String certificatePassword,
 	 * Sends a single push message.
 	 * @param msgBuilder The PayloadBuilder object.
 	 * @param token The push token.
-	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
 	 */
 	public void sendPush(final PayloadBuilder msgBuilder, final String token) {
 		ExecutorService executorService = Executors.newSingleThreadExecutor();
@@ -71,9 +74,7 @@ public void run() {
 	/**
 	 * Sends a bulk push message.
 	 * @param msgBuilder The Message.Builder object.
-	 * @param token The push token.
-	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @param tokens The push token.
 	 */
 	public void sendPushInBulk(final PayloadBuilder msgBuilder, final String... tokens) {
 		ExecutorService executorService = Executors.newSingleThreadExecutor();
@@ -97,26 +98,39 @@ public void run() {
 	}
 	
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncApplePushService#setupDevelopmentServer(java.lang.String, java.lang.String)
+	 * Sets up the APNS Sandbox environment.
+	 * @param certificatePath The path of the p12 certificate file.
+	 * @param certificatePassword The password for the p12 certificate.
+	 * @throws RuntimeIOException An IO exception.
+	 * @throws InvalidSSLConfig Certificates are corrupted, wrong or password is wrong.
 	 */
 	public void setupDevelopmentServer(String certificatePath, String certificatePassword) throws RuntimeIOException, InvalidSSLConfig {
 		((SyncApplePushService)pushService).setupDevelopmentServer(certificatePath, certificatePassword);
 	}
 	
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncApplePushService#setupProductionServer(java.lang.String, java.lang.String)
+	 * Sets up the APNS Production environment.
+	 * @param certificatePath The path of the p12 certificate file.
+	 * @param certificatePassword The password for the p12 certificate.
+	 * @throws RuntimeIOException An IO exception.
+	 * @throws InvalidSSLConfig Certificates are corrupted, wrong or password is wrong.
 	 */
 	public void setupProductionServer(String certificatePath, String certificatePassword) throws RuntimeIOException, InvalidSSLConfig {
 		((SyncApplePushService)pushService).setupProductionServer(certificatePath, certificatePassword);
 	}
 	
 	/**
-	 * @see com.devsu.push.sender.service.sync.SyncPushServiceBase#setPushEnabled(boolean)
+	 * Enables/disables this service.
+	 * @param pushEnabled The parameter that enables/disables this service.
 	 */
 	public void setPushEnabled(boolean pushEnabled) {
 		((SyncApplePushService)pushService).setPushEnabled(pushEnabled);
 	}
 	
+	/**
+	 * Gets a map of inactive devices.
+	 * @return a map of inactive devices.
+	 */
 	public Map<String, Date> getInactiveDevices() {
 		return ((SyncApplePushService)pushService).getInactiveDevices();
 	}
diff --git a/src/main/java/com/devsu/push/sender/service/sync/SyncAndroidPushService.java b/src/main/java/com/devsu/push/sender/service/sync/SyncAndroidPushService.java
index b394496..04df433 100644
--- a/src/main/java/com/devsu/push/sender/service/sync/SyncAndroidPushService.java
+++ b/src/main/java/com/devsu/push/sender/service/sync/SyncAndroidPushService.java
@@ -97,7 +97,7 @@ public boolean sendPush(final String title, final String message, final Map<Stri
 	 * @param msgBuilder The Message.Builder object.
 	 * @param token The push token.
 	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @throws Exception Any exception that may arise.
 	 */
 	public boolean sendPush(Message.Builder msgBuilder, String token) throws Exception {
 		if (!validateToken(log, token)) {
@@ -129,9 +129,9 @@ public boolean sendPushInBulk(final String title, final String message,
 	/**
 	 * Sends a bulk push message.
 	 * @param msgBuilder The Message.Builder object.
-	 * @param token The push token.
+	 * @param tokens The push token.
 	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @throws Exception Any exception that may arise.
 	 */
 	public boolean sendPushInBulk(Message.Builder msgBuilder, String... tokens) throws Exception {
 		boolean booleanResult = true;
diff --git a/src/main/java/com/devsu/push/sender/service/sync/SyncApplePushService.java b/src/main/java/com/devsu/push/sender/service/sync/SyncApplePushService.java
index 4127bf6..a9a4e29 100644
--- a/src/main/java/com/devsu/push/sender/service/sync/SyncApplePushService.java
+++ b/src/main/java/com/devsu/push/sender/service/sync/SyncApplePushService.java
@@ -35,8 +35,8 @@ public class SyncApplePushService extends SyncPushServiceBase {
 	 * @param certificatePath The path of the p12 certificate file.
 	 * @param certificatePassword The password for the p12 certificate.
 	 * @param useProductionServer Indicates if the services uses a Production environment or a Sandbox environment.
-	 * @throws RuntimeIOException
-	 * @throws InvalidSSLConfig
+	 * @throws RuntimeIOException An IO exception.
+	 * @throws InvalidSSLConfig Certificates are corrupted, wrong or password is wrong.
 	 */
 	public SyncApplePushService(String certificatePath, String certificatePassword, boolean useProductionServer) 
 			throws RuntimeIOException, InvalidSSLConfig {
@@ -77,7 +77,7 @@ public boolean sendPush(String title, String message, Map<String, String> additi
 	 * @param msgBuilder The PayloadBuilder object.
 	 * @param token The push token.
 	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @throws Exception Any exception that may arise.
 	 */
 	public boolean sendPush(PayloadBuilder msgBuilder, String token) throws Exception {
 		if (!validateToken(log, token)) {
@@ -111,9 +111,9 @@ public boolean sendPushInBulk(String title, String message,
 	/**
 	 * Sends a bulk push message.
 	 * @param msgBuilder The PayloadBuilder object.
-	 * @param token The push token.
+	 * @param tokens The push token.
 	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @throws Exception Any exception that may arise.
 	 */
 	public boolean sendPushInBulk(PayloadBuilder msgBuilder, String... tokens) throws Exception {
 		apnsService.start();
@@ -146,8 +146,8 @@ private PayloadBuilder generateBuilder(String title, String message, Map<String,
 	 * Sets up the APNS Sandbox environment.
 	 * @param certificatePath The path of the p12 certificate file.
 	 * @param certificatePassword The password for the p12 certificate.
-	 * @throws RuntimeIOException
-	 * @throws InvalidSSLConfig
+	 * @throws RuntimeIOException An IO exception.
+	 * @throws InvalidSSLConfig Certificates are corrupted, wrong or password is wrong.
 	 */
 	public void setupDevelopmentServer(String certificatePath, String certificatePassword) throws RuntimeIOException, InvalidSSLConfig {
 		apnsService = APNS.newService().withCert(certificatePath, certificatePassword).withSandboxDestination().build();
@@ -158,8 +158,8 @@ public void setupDevelopmentServer(String certificatePath, String certificatePas
 	 * Sets up the APNS Production environment.
 	 * @param certificatePath The path of the p12 certificate file.
 	 * @param certificatePassword The password for the p12 certificate.
-	 * @throws RuntimeIOException
-	 * @throws InvalidSSLConfig
+	 * @throws RuntimeIOException An IO exception.
+	 * @throws InvalidSSLConfig Certificates are corrupted, wrong or password is wrong.
 	 */
 	public void setupProductionServer(String certificatePath, String certificatePassword) throws RuntimeIOException, InvalidSSLConfig {
 		apnsService = APNS.newService().withCert(certificatePath, certificatePassword).withProductionDestination().build();
diff --git a/src/main/java/com/devsu/push/sender/service/sync/SyncPushService.java b/src/main/java/com/devsu/push/sender/service/sync/SyncPushService.java
index 8fd5b36..f950b23 100644
--- a/src/main/java/com/devsu/push/sender/service/sync/SyncPushService.java
+++ b/src/main/java/com/devsu/push/sender/service/sync/SyncPushService.java
@@ -9,7 +9,7 @@ public interface SyncPushService {
 	 * @param message The push message content.
 	 * @param token The push token.
 	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @throws Exception Any exception that may arise.
 	 */
 	boolean sendPush(String message, String token) throws Exception;
 
@@ -19,7 +19,7 @@ public interface SyncPushService {
 	 * @param message The push message content.
 	 * @param token The push token.
 	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @throws Exception Any exception that may arise.
 	 */
 	boolean sendPush(String title, String message, String token) throws Exception;
 
@@ -30,7 +30,7 @@ public interface SyncPushService {
 	 * @param additionalFields The additional fields sent on the push message.
 	 * @param token The push token.
 	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @throws Exception Any exception that may arise.
 	 */
 	boolean sendPush(String title, String message, Map<String, String> additionalFields, String token) throws Exception;
 
@@ -39,7 +39,7 @@ public interface SyncPushService {
 	 * @param message The push message content.
 	 * @param tokens The push tokens.
 	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @throws Exception Any exception that may arise.
 	 */
 	boolean sendPushInBulk(String message, String... tokens) throws Exception;
 
@@ -49,7 +49,7 @@ public interface SyncPushService {
 	 * @param message The push message content.
 	 * @param tokens The push tokens.
 	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @throws Exception Any exception that may arise.
 	 */
 	boolean sendPushInBulk(String title, String message, String... tokens) throws Exception;
 
@@ -60,7 +60,7 @@ public interface SyncPushService {
 	 * @param additionalFields The additional fields sent on the push message.
 	 * @param tokens The push tokens.
 	 * @return <i>true</i> if the push message request was sent. 
-	 * @throws Exception
+	 * @throws Exception Any exception that may arise.
 	 */
 	boolean sendPushInBulk(String title, String message, Map<String, String> additionalFields, String... tokens) throws Exception;
 }
diff --git a/src/main/java/com/devsu/push/sender/util/ArrayUtil.java b/src/main/java/com/devsu/push/sender/util/ArrayUtil.java
index 714820c..d277369 100644
--- a/src/main/java/com/devsu/push/sender/util/ArrayUtil.java
+++ b/src/main/java/com/devsu/push/sender/util/ArrayUtil.java
@@ -11,6 +11,7 @@ public class ArrayUtil {
 
 	/**
 	 * Splits an array in a list of subarrays of size <i>maxSubArraySize</i>.
+	 * @param <T> The class of the elements in the array.
 	 * @param elementArray The array to be split.
 	 * @param maxSubArraySize The final size of the subarrays.
 	 * @return The list containing the subarrays.