diff --git a/src/Russian/RussianLanguage.php b/src/Russian/RussianLanguage.php
index 30cdefe..0f5b3b4 100644
--- a/src/Russian/RussianLanguage.php
+++ b/src/Russian/RussianLanguage.php
@@ -120,7 +120,7 @@ protected static function isVelarConsonant($consonant)
      */
     public static function countSyllables($string)
     {
-        return S::chars_count($string, self::$vowels);
+        return S::countChars($string, self::$vowels);
     }
 
     /**
@@ -137,7 +137,7 @@ public static function isPaired($consonant)
      */
     public static function checkLastConsonantSoftness($word)
     {
-        if (($substring = S::last_position_for_one_of_chars(S::lower($word), self::$consonants)) !== false) {
+        if (($substring = S::findLastPositionForOneOfChars(S::lower($word), self::$consonants)) !== false) {
             if (in_array(S::slice($substring, 0, 1), ['й', 'ч', 'щ'])) { // always soft consonants
                 return true;
             } elseif (S::length($substring) > 1 && in_array(S::slice($substring, 1, 2), ['е', 'ё', 'и', 'ю', 'я', 'ь'])) { // consonants are soft if they are trailed with these vowels
diff --git a/src/S.php b/src/S.php
index 927181d..6f796af 100644
--- a/src/S.php
+++ b/src/S.php
@@ -9,7 +9,7 @@ class S
     /**
      * Sets encoding for using in morphos/* functions.
      */
-    public static function set_encoding($encoding)
+    public static function setEncoding($encoding)
     {
         if (function_exists('mb_internal_encoding')) {
             mb_internal_encoding($encoding);
@@ -93,7 +93,7 @@ public static function name($string)
     /**
      * multiple substr_count().
      */
-    public static function chars_count($string, array $chars)
+    public static function countChars($string, array $chars)
     {
         if (function_exists('mb_split')) {
             return count(mb_split('('.implode('|', $chars).')', $string)) - 1;
@@ -102,7 +102,7 @@ public static function chars_count($string, array $chars)
         }
     }
 
-    public static function last_position_for_one_of_chars($string, array $chars)
+    public static function findLastPositionForOneOfChars($string, array $chars)
     {
         if (function_exists('mb_strrpos')) {
             $last_position = false;
diff --git a/src/initialization.php b/src/initialization.php
index 6847a50..ff21068 100644
--- a/src/initialization.php
+++ b/src/initialization.php
@@ -1,2 +1,2 @@
 <?php
-morphos\S::set_encoding('utf-8');
+morphos\S::setEncoding('utf-8');