diff --git a/src/wp-load.php b/src/wp-load.php
index 3d8f19b92b..622865959e 100644
--- a/src/wp-load.php
+++ b/src/wp-load.php
@@ -25,6 +25,11 @@ if ( ! defined( 'ABSPATH' ) ) {
  * The error_reporting() function can be disabled in php.ini. On systems where that is the case,
  * it's best to add a dummy function to the wp-config.php file, but as this call to the function
  * is run prior to wp-config.php loading, it is wrapped in a function_exists() check.
+ *
+ * Initialize error reporting to a known set of levels.
+ *
+ * This will be adapted in wp_debug_mode located in wp-includes/load.php based on WP_DEBUG.
+ * @see http://php.net/manual/en/errorfunc.constants.php List of known error levels.
  */
 if ( function_exists( 'error_reporting' ) ) {
 	error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );