diff --git a/man5/nsswitch.conf.5 b/man5/nsswitch.conf.5
index 0405d4ff7..007c5826f 100644
--- a/man5/nsswitch.conf.5
+++ b/man5/nsswitch.conf.5
@@ -277,6 +277,10 @@ If the group is also found in the next entry (and the group name and GID
 are an exact match), the member list of the second entry will be added
 to the group object to be returned.
 Available since glibc 2.24.
+Note that merging will not be done for
+.BR getgrent (3)
+nor will duplicate members be pruned when they occur in both entries
+being merged.
 .RE
 .SS Compatibility mode (compat)
 The NSS "compat" service is similar to "files" except that it