diff --git a/README.md b/README.md
index d7fc190..471a607 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,9 @@ using normal Elm syntax.
 "helloworld" : String
 ```
 
+Please note that the first time you run elm-repl it might be slow, 
+because it needs to download the packages. 
+
 The same can be done with definitions and union types:
 
 ```elm