diff --git a/en/development/debugging.rst b/en/development/debugging.rst
index c96699cd9a..a0397a0f6a 100644
--- a/en/development/debugging.rst
+++ b/en/development/debugging.rst
@@ -24,6 +24,15 @@ default.
 Output from this function is only shown if the core ``$debug`` variable
 has been set to ``true``.
 
+.. versionadded:: 3.3.0
+
+    Calling this method will return passed ``$var``, so that you can, for instance,
+    place it in return statements, for example::
+    
+        return debug($data); // will return $data in any case.
+
+Also see ``pr()`` and ``pj()``.
+
 .. php:function:: stackTrace()
 
 The ``stackTrace()`` function is available globally, and allows you to output