--- share/man/man9/ucred.9	(revision 307332)
+++ share/man/man9/ucred.9	(working copy)
@@ -32,6 +32,7 @@ 
 .Sh NAME
 .Nm ucred ,
 .Nm crget ,
+.Nm crextend ,
 .Nm crhold ,
 .Nm crfree ,
 .Nm crshared ,
@@ -44,7 +45,9 @@ 
 .In sys/param.h
 .In sys/ucred.h
 .Ft "struct ucred *"
-.Fn crget void
+.Fn crget "int ngroups"
+.Ft void
+.Fn crextend "struct ucred *cr, int n"
 .Ft "struct ucred *"
 .Fn crhold "struct ucred *cr"
 .Ft void
@@ -74,9 +77,18 @@ 
 .Fn crget
 function allocates memory
 for a new structure, sets its reference count to 1, and
-initializes its lock.
+initializes its lock.  Memory to hold
+.Vt ngroups
+is allocated.  Values less than 16 have no effect as that
+is the minimum group buffer size used.
 .Pp
 The
+.Fn crextend
+function increases the buffer size for holding groups to to
+.Vt n
+items.  Previously stored groups will be lost after this operation.
+.Pp
+The
 .Fn crhold
 function increases the reference count on the credential.
 .Pp