diff --git a/README b/README
index f07f88ebd..5e9b92a2f 100644
--- a/README
+++ b/README
@@ -1,6 +1,7 @@
 Z3 is a theorem prover from Microsoft Research.
 Z3 is licensed under the MIT license. 
 Z3 can be built using Visual Studio Command Prompt and make/g++.
+It relies on Python2 for configuring build scripts.
 
 1) Building Z3 on Windows using Visual Studio Command Prompt