diff --git a/README.md b/README.md
index 2194677..3fe60ab 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Requires an IRC WebSocket server.
 
 First install dependencies:
 
-    npm install --production
+    npm install --omit=dev
 
 Then [configure an HTTP server] to serve the gamja files.