diff --git a/ipaddresses.php b/ipaddresses.php
index e9084b8..ee7082b 100644
--- a/ipaddresses.php
+++ b/ipaddresses.php
@@ -92,11 +92,12 @@ class ipaddresses
     return true;
   }
 
-  /** Return the IPv6 to compressed form.
+  /** Return the IPv6 to compressed (or compact) form.
     * Remove the 0 when they are placed on the begin of the nibble.
     * Remove all the blocks only zero to convert them to :: (but only one time)
     * Example: 2001:0660:530d:0201:0000:0000:0000:0124 => 2001:660:530d:201::124
     * If an IPv4 is provided, return it without modification
+    * @param string $ip The IP to compress
     */
   public function compressIP ($ip)
   {