Mention PIL requirement.

diff --git a/INSTALL.markdown b/INSTALL.markdown
index 5aacd5e493a709c50d8a024ad2522475425414c8..e6cfb6116af5b0c2817ebbf491c56f372a371cfd 100644 (file)
--- a/INSTALL.markdown
+++ b/INSTALL.markdown
@@ -9,6 +9,8 @@ Requirements common for all platforms:
 
 * Python version 2.6 or 2.7
 
+  * Python Image Library
+
 * CMake version 2.8 or higher (tested with version 2.8)