diff --git a/appendixa/shadowpwd-desc.sgml b/appendixa/shadowpwd-desc.sgml
index 22cb73916..3eb409d27 100644
--- a/appendixa/shadowpwd-desc.sgml
+++ b/appendixa/shadowpwd-desc.sgml
@@ -42,7 +42,7 @@ chsh  changes the user login shell.
 <sect3><title>expiry</title>
 
 <para>
-It's currently unknown what this program is for.
+Checks and enforces password expiration policy.
 </para>
 
 </sect3>