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diff --git a/README.md b/README.md
index 694d140..1996a57 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,8 @@ c-unit-testing
 ==============
 
 simple unit testing for C implemented as a single header file
+
+**WARNING: this will work fine in gcc, but it uses the non-standard
+macro \__COUNTER__ and nested functions.**
+
+[documentation (pdf)](https://github.com/shmibs/c-unit-testing/blob/master/README.pdf?raw=true)