diff --git a/install.sh b/install.sh
index c4e6d6253e..9004176e9a 100644
--- a/install.sh
+++ b/install.sh
@@ -1,3 +1,4 @@
+# run with PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true sh install.sh if chrome is already installed
 sh synapse/install.sh
 sh riot/install.sh
 npm install