diff --git a/system/helpers/security_helper.php b/system/helpers/security_helper.php
index 6187a4a..3e6e914 100644
--- a/system/helpers/security_helper.php
+++ b/system/helpers/security_helper.php
@@ -77,6 +77,9 @@
 	/**
 	 * Hash encode a string
 	 *
+	 * This function is DEPRECATED and should be removed in
+	 * CodeIgniter 3.1+. Use hash() instead.
+	 *
 	 * @param	string
 	 * @param	string
 	 * @return	string