diff --git a/README.md b/README.md
index 511c25a0..b9d997a5 100644
--- a/README.md
+++ b/README.md
@@ -1019,7 +1019,7 @@ To customize the image format / orientation:
 rake state_machine:draw FILE=vehicle.rb CLASS=Vehicle FORMAT=jpg ORIENTATION=landscape
 ```
 
-See http://rdoc.info/github/glejeune/Ruby-Graphviz/Constants for the list of
+See http://rdoc.info/github/glejeune/Ruby-Graphviz/GraphViz/Constants for the list of
 supported image formats.  If resolution is an issue, the svg format may offer
 better results.