diff --git a/user_guide_src/source/general/common_functions.rst b/user_guide_src/source/general/common_functions.rst
index 32e8a8b..e085ef8 100644
--- a/user_guide_src/source/general/common_functions.rst
+++ b/user_guide_src/source/general/common_functions.rst
@@ -96,11 +96,10 @@
 log_message()
 =============
 
-.. php:function:: log_message($level, $message, $php_error = FALSE)
+.. php:function:: log_message($level, $message)
 
 	:param	string	$level: Log level: 'error', 'debug' or 'info'
 	:param	string	$message: Message to log
-	:param	bool	$php_error: Whether we're logging a native PHP error message
 	:returns:	void
 
 This function is an alias for ``CI_Log::write_log()``. For more info,