diff --git a/README.md b/README.md
index 4ef248d..b02e71b 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,8 @@ Support
 
 I've tested func\_timeout with python 2.7, 3.4, and 3.5. It should work on other versions as well.
 
+Works on windows, linux/unix, cygwin, mac
+
 ChangeLog can be found at https://raw.githubusercontent.com/kata198/func_timeout/master/ChangeLog 
 
 Pydoc can be found at: http://htmlpreview.github.io/?https://github.com/kata198/func_timeout/blob/master/doc/func_timeout.html?vers=1
diff --git a/README.rst b/README.rst
index cf66145..0acfe63 100644
--- a/README.rst
+++ b/README.rst
@@ -80,6 +80,8 @@ Support
 
 I've tested func\_timeout with python 2.7, 3.4, and 3.5. It should work on other versions as well.
 
+Works on windows, linux/unix, cygwin, mac
+
 ChangeLog can be found at https://raw.githubusercontent.com/kata198/func_timeout/master/ChangeLog 
 
 Pydoc can be found at: http://htmlpreview.github.io/?https://github.com/kata198/func_timeout/blob/master/doc/func_timeout.html?vers=1