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-rw-r--r--Doc/library/os.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 2f7b370..9dc49a2 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -287,7 +287,8 @@ process and user.
Return list of group ids that *user* belongs to. If *group* is not in the
list, it is included; typically, *group* is specified as the group ID
- field from the password record for *user*.
+ field from the password record for *user*, because that group ID will
+ otherwise be potentially omitted.
.. availability:: Unix.