diff --git a/README.development b/README.development
index f9aede636..044f31e31 100644
--- a/README.development
+++ b/README.development
@@ -30,7 +30,8 @@ need to use WSL or Cygwin to use them.
 
 Once you've installed the above components, execute ./run in this repo,
 which will build the subcomponents, and start Anki. Any arguments included
-on the command line will be passed on to Anki.
+on the command line will be passed on to Anki. The first run will take
+quite a while to download and build everything - please be patient.
 
 Before contributing code, please read README.contributing.