diff --git a/README.md b/README.md
index 5a43257..9c98d35 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,8 @@ pip3 install google-yubikey
     google-yubikey generate-key > yubikey.pem
     ```
 
+    The output `yubikey.pem` above is public - to be used in the next step.
+
 3.  Install [Google Cloud SDK](https://cloud.google.com/sdk/install) and run:
 
     ```