From 4cdddfed8e89a09875aa3ef3de06c295a758d9a9 Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Sat, 24 Jun 2017 13:12:09 +0300
Subject: [PATCH] docs/gc: Mark mem_alloc()/mem_free() as uPy-specific.

---
 docs/library/gc.rst | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/docs/library/gc.rst b/docs/library/gc.rst
index 01e63ae51e..94422f23eb 100644
--- a/docs/library/gc.rst
+++ b/docs/library/gc.rst
@@ -24,6 +24,17 @@ Functions
 
    Return the number of bytes of heap RAM that are allocated.
 
+   .. admonition:: Difference to CPython
+      :class: attention
+
+      This function is MicroPython extension.
+
 .. function:: mem_free()
 
-   Return the number of bytes of available heap RAM.
+   Return the number of bytes of available heap RAM, or -1 if this amount
+   is not known.
+
+   .. admonition:: Difference to CPython
+      :class: attention
+
+      This function is MicroPython extension.