Use `usermod -aG` to add www-data to gitlab-www

The `usermod -G` invocation changes the primary group ID of the user. With `usermod -aG`, you add a supplementary group membership to the user, preserving their primary group.

Use `usermod -aG` to add www-data to gitlab-www
The `usermod -G` invocation changes the primary group ID of the user. With `usermod -aG`, you add a supplementary group membership to the user, preserving their primary group.
Jacob Vosmaer
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README.md
@@ -350,7 +350,7 @@ To allow an external webserver access to GitLab, you will need to add the webser
 Let's say that webserver user is `www-data`. Adding the user to `gitlab-www` group can be done with:
  
 ```
-usermod -G gitlab-www www-data
+usermod -aG gitlab-www www-data
 ```
  
 Run `sudo gitlab-ctl reconfigure` for the change to take effect.
...	...	@@ -350,7 +350,7 @@ To allow an external webserver access to GitLab, you will need to add the webser
350	350	Let's say that webserver user is `www-data`. Adding the user to `gitlab-www` group can be done with:
351	351
352	352	```
353		-usermod -G gitlab-www www-data
	353	+usermod -aG gitlab-www www-data
354	354	```
355	355
356	356	Run `sudo gitlab-ctl reconfigure` for the change to take effect.
...	...