diff --git a/src/mime_types/get_mime_type.test.ts b/src/mime_types/get_mime_type.test.ts
index ae30cef..2a3b6c7 100644
--- a/src/mime_types/get_mime_type.test.ts
+++ b/src/mime_types/get_mime_type.test.ts
@@ -24,7 +24,8 @@ Deno.test(
                     getMIMEType(
                         defaultMIMETypes,
                         'html'
-                    ), 'text/html'
+                    ),
+                    'text/html'
                 );
             }
         });
@@ -41,7 +42,7 @@ Deno.test(
                 assertEquals(
                     getMIMEType(
                         defaultMIMETypes,
-                        'jsm'
+                        'mjs'
                     ),
                     'application/javascript'
                 );
diff --git a/src/mime_types/get_mime_type.ts b/src/mime_types/get_mime_type.ts
index cf11373..39999ba 100644
--- a/src/mime_types/get_mime_type.ts
+++ b/src/mime_types/get_mime_type.ts
@@ -1,6 +1,17 @@
 import { MIMETypesObject } from "./mime_type_object.d.ts";
 
-export function getMIMEType(mIMETypesObject : MIMETypesObject, extension : string) : string {
+/**
+ * This function returns the correct MIME type based on the file extension. If the extension does not exist on the MIME
+ * types object, the default MIME type gets returned.
+ * 
+ * @param mIMETypesObject The MIME types object from where to get the MIME types
+ * @param extension The file extension to search for
+ * @returns The MIME type for the extension or the default MIME type
+ */
+export function getMIMEType(
+    mIMETypesObject : MIMETypesObject,
+    extension : string
+) : string {
     const MIMETypesMap = Object.entries(mIMETypesObject.types).reduce((
             map,
             [