diff --git a/Makefile.config.example b/Makefile.config.example
index f9d8be80100..9a75f5e55d5 100644
--- a/Makefile.config.example
+++ b/Makefile.config.example
@@ -46,7 +46,7 @@ LIBRARY_DIRS := $(PYTHON_LIB) /usr/local/lib /usr/lib
 BUILD_DIR := build
 DISTRIBUTE_DIR := distribute
 
-# Uncomment for debugging.
+# Uncomment for debugging. Does not work on OSX due to https://github.com/BVLC/caffe/issues/171
 # DEBUG := 1
 
 # The ID of the GPU that 'make runtest' will use to run unit tests.