diff --git a/README.md b/README.md
index 3a02de80..203bf687 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ end
 
 Generate the docs!
 
-    $ rake docs:generate
+    $ RAILS_ENV=test rake docs:generate
     $ open doc/api/index.html
 
 ### Viewers