diff --git a/includes/errors.inc b/includes/errors.inc
index 3a97b6daa036..be72428560fb 100644
--- a/includes/errors.inc
+++ b/includes/errors.inc
@@ -172,9 +172,9 @@ function error_displayable($error = NULL) {
  * Log a PHP error or exception, display an error page in fatal cases.
  *
  * @param $error
- *   An array with the following keys: %type, !message, %function, %file, %line.
- *   All the parameters are plain-text, exception message, which needs to be
- *   a safe HTML string.
+ *   An array with the following keys: %type, !message, %function, %file, %line
+ *   and severity_level. All the parameters are plain-text, with the exception of
+ *   !message, which needs to be a safe HTML string.
  * @param $fatal
  *   TRUE if the error is fatal.
  */