diff --git a/README b/README
index 9825bdaf4..34e432467 100644
--- a/README
+++ b/README
@@ -6,7 +6,7 @@ Requirements
 ------------
 In order to build awesome itself, you need header files and libs of:
   - cmake
-  - Xlib, xcb and xcb-util
+  - Xlib, xcb and xcb-util (>= 0.2.1)
   - Lua 5.1
   - cairo
   - pango and pangocairo