diff --git a/src/lib/libutil/imsg_init.3 b/src/lib/libutil/imsg_init.3
index ffca89d9..f1a32f4b 100644
--- a/src/lib/libutil/imsg_init.3
+++ b/src/lib/libutil/imsg_init.3
@@ -1,4 +1,4 @@
-.\" $OpenBSD: imsg_init.3,v 1.20 2017/12/06 12:07:08 zhuk Exp $
+.\" $OpenBSD: imsg_init.3,v 1.21 2018/02/16 07:42:07 nicm Exp $
 .\"
 .\" Copyright (c) 2010 Nicholas Marriott <nicm@openbsd.org>
 .\"
@@ -14,7 +14,7 @@
 .\" IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 .\" OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: December 6 2017 $
+.Dd $Mdocdate: February 16 2018 $
 .Dt IMSG_INIT 3
 .Os
 .Sh NAME
@@ -66,7 +66,7 @@
 .Fn imsg_create "struct imsgbuf *ibuf" "uint32_t type" "uint32_t peerid" \
     "pid_t pid" "uint16_t datalen"
 .Ft int
-.Fn imsg_add "struct ibuf *buf" "const void *data" "uint16_t datalen"
+.Fn imsg_add "struct ibuf *msg" "const void *data" "uint16_t datalen"
 .Ft void
 .Fn imsg_close "struct imsgbuf *ibuf" "struct ibuf *msg"
 .Ft void
@@ -181,19 +181,19 @@ returns a pointer to a new message if it succeeds, NULL otherwise.
 .Pp
 .Fn imsg_add
 appends to
-.Fa imsg
-.Fa len
+.Fa msg
+.Fa datalen
 bytes of ancillary data pointed to by
-.Fa buf .
+.Fa data .
 It returns
 .Fa len
 if it succeeds, \-1 otherwise.
 .Pp
 .Fn imsg_close
 completes creation of
-.Fa imsg
+.Fa msg
 by adding it to
-.Fa imsgbuf
+.Fa ibuf
 output buffer.
 .Pp
 .Fn imsg_compose
@@ -391,7 +391,7 @@ ready to be sent.
 The
 .Fn ibuf_write
 routine transmits as many pending buffers as possible from
-.Fn msgbuf
+.Fa msgbuf
 using
 .Xr writev 2 .
 It returns 1 if it succeeds, \-1 on error and 0 when no buffers were