diff --git a/README.md b/README.md
index e6fe7fc7a82b..8ca18f871d85 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ and code.
   - PostGIS 2.0.x
   - Mapnik 2.1.1
   - Windshaft-cartodb
-  - Varnish 2.1+
+  - Varnish 2.1+ (WARNING: must be < 3.0!)
 
 # How do I install CartoDB? #