diff --git a/gnu/usr.bin/groff/tmac/mdoc.local b/gnu/usr.bin/groff/tmac/mdoc.local
index 3198b5b5602..14891b1c27a 100644
--- a/gnu/usr.bin/groff/tmac/mdoc.local
+++ b/gnu/usr.bin/groff/tmac/mdoc.local
@@ -50,6 +50,7 @@
 .ds doc-str-Lb-libipx      IPX Address Conversion Support Library (libipx, \-lipx)
 .ds doc-str-Lb-libmd       Message Digest (MD4, MD5, etc.) Support Library (libmd, \-lmd)
 .ds doc-str-Lb-libnetgraph Netgraph User Library (libnetgraph, \-lnetgraph)
+.ds doc-str-Lb-libpam      PAM Library (libpam, \-lpam)
 .ds doc-str-Lb-librpcsvc   RPC Service Library (librpcsvc, \-lrpcsvc)
 .ds doc-str-Lb-libskey     S/Key Password Control Table Access Library (libskey, \-lskey)
 .ds doc-str-Lb-libusb      USB HID access routines library (libusb, \-lusb)