diff --git a/engineering-guide/accounts-and-groups.md b/engineering-guide/accounts-and-groups.md
index 07bba09d..f33c458e 100644
--- a/engineering-guide/accounts-and-groups.md
+++ b/engineering-guide/accounts-and-groups.md
@@ -83,7 +83,7 @@ Note the field 4 (home/mobile number) we do not set, thus we have an empty field
 
 
 ## Primary Groups
-By default the user group is `unx-nogroup`. The exception are experiment accounts, where the primary group is the corresponding g-group.
+By default the primary user group is `unx-nogroup` (710). The exception are experiment accounts, where the primary group is the corresponding g-group.
 
 If there are good reasons (example?) another primary group might be set.