acct-user.eclass: Document primary/supplementary groups

Closes: https://bugs.gentoo.org/692964
Signed-off-by: Michał Górny <mgorny@gentoo.org>

diff --git a/eclass/acct-user.eclass b/eclass/acct-user.eclass
index 0ce7545cd1c57df535a2b7455491d780a163f19a..c2e643332ccc380d5072e4e90f76a1cdc1f6fea0 100644 (file)
--- a/eclass/acct-user.eclass
+++ b/eclass/acct-user.eclass
@@ -108,7 +108,8 @@ readonly ACCT_USER_NAME
 # @REQUIRED
 # @DESCRIPTION:
 # List of groups the user should belong to.  This must be a bash
-# array.
+# array.  The first group specified is the user's primary group, while
+# the remaining groups (if any) become supplementary groups.
 
 
 # << Boilerplate ebuild variables >>