diff --git a/support/doc/dependencies.md b/support/doc/dependencies.md
index 9666d72af..939772a9d 100644
--- a/support/doc/dependencies.md
+++ b/support/doc/dependencies.md
@@ -307,7 +307,7 @@ brew services run redis
 ```
 
 On macOS, the `postgresql` user can be `_postgres` instead of `postgres`.
-If `sudo -u postgres createuser -P peertube` gives you an error, you can try `sudo -u _postgres createuser -U peertube`.
+If `sudo -u postgres createuser -P peertube` gives you an `unknown user: postgres` error, you can try `sudo -u _postgres createuser -U peertube`.
 
 ## Gentoo