diff --git a/share/man/man9/VOP_ALLOCATE.9 b/share/man/man9/VOP_ALLOCATE.9
--- a/share/man/man9/VOP_ALLOCATE.9
+++ b/share/man/man9/VOP_ALLOCATE.9
@@ -27,7 +27,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 3, 2013
+.Dd November 8, 2021
 .Dt VOP_ALLOCATE 9
 .Os
 .Sh NAME
@@ -37,7 +37,13 @@
 .In sys/param.h
 .In sys/vnode.h
 .Ft int
-.Fn VOP_ALLOCATE "struct vnode *vp" "off_t *offset" "off_t *len"
+.Fo VOP_ALLOCATE
+.Fa "struct vnode *vp"
+.Fa "off_t *offset"
+.Fa "off_t *len"
+.Fa "int ioflag"
+.Fa "struct ucred *cred"
+.Fc
 .Sh DESCRIPTION
 This call allocates storage for a range of offsets in a file.
 It is used to implement the
@@ -52,6 +58,10 @@
 The start of the range to allocate storage for in the file.
 .It Fa len
 The length of the range to allocate storage for in the file.
+.It Fa ioflag
+Directives and hints to be given to the file system.
+.It Fa cred
+The credentials of the caller.
 .El
 .Pp
 The