From ec8c670d6a078baf186edfe69f32a6097c0f06ed Mon Sep 17 00:00:00 2001
From: Carlos Fenollosa <carlos.fenollosa@gmail.com>
Date: Tue, 19 Aug 2014 11:56:33 +0200
Subject: [PATCH] Update README.md

---
 README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README.md b/README.md
index d3d3d20..26b7ab6 100644
--- a/README.md
+++ b/README.md
@@ -118,4 +118,5 @@ As a guideline, pull requests should:
 - Add a use case which is arguably very common (e.g. disqus integration for comments)
 - Be very small when possible (a couple lines of code)
 - Don't require a significant rewrite of the code (`create_html_file`, `write_entry`, etc)
+- It must work on Linux, BSD and Mac. Beware of using GNU coreutils with non-POSIX flags (i.e. `date` or `grep`)
 - **Always** keep backwards compatibility when using the default configuration