diff --git a/README.md b/README.md
index 679cb12..a950a2b 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,5 @@ pypscl
 ======
 
 This repo tries to provide a pythonic wrapper for the R pscl and wnominate packages.
+
+Requires R version 3 and Pandas 0.12.