diff --git a/Doc/lib/libgrp.tex b/Doc/lib/libgrp.tex
index 2925297..8286081 100644
--- a/Doc/lib/libgrp.tex
+++ b/Doc/lib/libgrp.tex
@@ -22,17 +22,19 @@
 The gid is an integer, name and password are strings, and the member
 list is a list of strings.
 (Note that most users are not explicitly listed as members of the
-group they are in according to the password database.)
-\exception{KeyError} is raised if the entry asked for cannot be found.
+group they are in according to the password database.  Check both
+databases to get complete membership information.)
 
 It defines the following items:
 
 \begin{funcdesc}{getgrgid}{gid}
 Return the group database entry for the given numeric group ID.
+\exception{KeyError} is raised if the entry asked for cannot be found.
 \end{funcdesc}
 
 \begin{funcdesc}{getgrnam}{name}
 Return the group database entry for the given group name.
+\exception{KeyError} is raised if the entry asked for cannot be found.
 \end{funcdesc}
 
 \begin{funcdesc}{getgrall}{}