diff --git a/POSTINSTALL.md b/POSTINSTALL.md
index 76c5a0f..6b19377 100644
--- a/POSTINSTALL.md
+++ b/POSTINSTALL.md
@@ -1,6 +1,6 @@
 Accounts are created with the username and the subdomain under which this app is installed
  e.g. `@$CLOUDRON-USERNAME@$CLOUDRON-APP-DOMAIN`. Note that Mastodon does NOT allow this subdomain
-to be changed later as it breaks federation. So, you have to install Mastodon in the correct
+to be changed later as it breaks federation. So, you have to set up Mastodon in the correct
 subdomain from the get-go.
 
 <sso>