diff --git a/system/core/Common.php b/system/core/Common.php
index b4f0c38..cad340f 100644
--- a/system/core/Common.php
+++ b/system/core/Common.php
@@ -424,12 +424,12 @@
 	 * We use this as a simple mechanism to access the logging
 	 * class and send messages to be logged.
 	 *
-	 * @param	string
-	 * @param	string
-	 * @param	bool
+	 * @param	string	the error level: 'error', 'debug' or 'info'
+	 * @param	string	the error message
+	 * @param	bool	whether the error is a native PHP error
 	 * @return	void
 	 */
-	function log_message($level = 'error', $message, $php_error = FALSE)
+	function log_message($level, $message, $php_error = FALSE)
 	{
 		static $_log, $_log_threshold;
 
diff --git a/system/core/Log.php b/system/core/Log.php
index a84d3dc..e4d72b5 100644
--- a/system/core/Log.php
+++ b/system/core/Log.php
@@ -138,12 +138,12 @@
 	 *
 	 * Generally this function will be called using the global log_message() function
 	 *
-	 * @param	string	the error level
+	 * @param	string	the error level: 'error', 'debug' or 'info'
 	 * @param	string	the error message
 	 * @param	bool	whether the error is a native PHP error
 	 * @return	bool
 	 */
-	public function write_log($level = 'error', $msg, $php_error = FALSE)
+	public function write_log($level, $msg, $php_error = FALSE)
 	{
 		if ($this->_enabled === FALSE)
 		{