diff --git a/aucat/aucat.c b/aucat/aucat.c
index bd3f59e..68293af 100644
--- a/aucat/aucat.c
+++ b/aucat/aucat.c
@@ -1165,6 +1165,7 @@ playrec(char *dev, int mode, int bufsz, char *port)
 	if (dev_mh)
 		n += mio_nfds(dev_mh);
 	pfds = xmalloc(n * sizeof(struct pollfd));
+
 	for (s = slot_list; s != NULL; s = s->next)
 		slot_init(s);
 	if (dev_mh == NULL)
diff --git a/libsndio/mio.c b/libsndio/mio.c
index 42f938c..95c89cc 100644
--- a/libsndio/mio.c
+++ b/libsndio/mio.c
@@ -141,10 +141,6 @@ mio_read(struct mio_hdl *hdl, void *buf, size_t len)
 		hdl->eof = 1;
 		return 0;
 	}
-	if (len == 0) {
-		DPRINTF("mio_read: zero length read ignored\n");
-		return 0;
-	}
 	while (todo > 0) {
 		n = hdl->ops->read(hdl, data, todo);
 		if (n == 0 && hdl->eof)
@@ -175,14 +171,6 @@ mio_write(struct mio_hdl *hdl, const void *buf, size_t len)
 		hdl->eof = 1;
 		return 0;
 	}
-	if (len == 0) {
-		DPRINTF("mio_write: zero length write ignored\n");
-		return 0;
-	}
-	if (todo == 0) {
-		DPRINTF("mio_write: zero length write ignored\n");
-		return 0;
-	}
 	while (todo > 0) {
 		n = hdl->ops->write(hdl, data, todo);
 		if (n == 0) {
diff --git a/libsndio/mio_open.3 b/libsndio/mio_open.3
index 164560b..85870c2 100644
--- a/libsndio/mio_open.3
+++ b/libsndio/mio_open.3
@@ -53,7 +53,7 @@ library allows user processes to access
 hardware and
 .Xr sndiod 8
 MIDI thru boxes and control ports in a uniform way.
-.Ss Opening and closing an MIDI stream
+.Ss Opening and closing a MIDI stream
 First the application must call the
 .Fn mio_open
 function to obtain a handle representing the newly created stream;
diff --git a/libsndio/sio.c b/libsndio/sio.c
index 1f4c55c..b1e659c 100644
--- a/libsndio/sio.c
+++ b/libsndio/sio.c
@@ -311,10 +311,6 @@ sio_read(struct sio_hdl *hdl, void *buf, size_t len)
 		hdl->eof = 1;
 		return 0;
 	}
-	if (todo == 0) {
-		DPRINTF("sio_read: zero length read ignored\n");
-		return 0;
-	}
 	while (todo > 0) {
 		if (!sio_rdrop(hdl))
 			return 0;
@@ -352,10 +348,6 @@ sio_write(struct sio_hdl *hdl, const void *buf, size_t len)
 		hdl->eof = 1;
 		return 0;
 	}
-	if (todo == 0) {
-		DPRINTF("sio_write: zero length write ignored\n");
-		return 0;
-	}
 	while (todo > 0) {
 		if (!sio_wsil(hdl))
 			return 0;
diff --git a/libsndio/sio_open.3 b/libsndio/sio_open.3
index b491e13..8c00880 100644
--- a/libsndio/sio_open.3
+++ b/libsndio/sio_open.3
@@ -284,6 +284,11 @@ Applications that need to have a set of working
 parameter combinations in advance can use the
 .Fn sio_getcap
 function.
+However, for most new applications it's generally
+not recommended to use
+.Fn sio_getcap .
+Instead, follow the recommendations for negotiating
+device parameters (see above).
 .Pp
 The
 .Vt sio_cap
@@ -367,6 +372,11 @@ structure, then the second element of the
 array of the
 .Vt sio_cap
 structure is valid for this configuration.
+As such, when reading the array elements in the
+.Vt sio_cap
+structure, the corresponding
+.Vt sio_conf
+bitmasks should always be used.
 .El
 .Ss Starting and stopping the device
 The
diff --git a/midicat/midicat.1 b/midicat/midicat.1
index bb95e1b..3725ebb 100644
--- a/midicat/midicat.1
+++ b/midicat/midicat.1
@@ -19,7 +19,7 @@
 .Os
 .Sh NAME
 .Nm midicat
-.Nd send to or receive from MIDI ports.
+.Nd send to or receive from MIDI ports
 .Sh SYNOPSIS
 .Nm midicat
 .Bk -words
@@ -75,7 +75,7 @@ $ midicat -d -q rmidi/0 -o /dev/null
 Send data from
 .Pa rmidi/0
 to
-.Pa midithru/0:
+.Pa midithru/0 :
 .Bd -literal -offset indent
 $ midicat -q rmidi/0 -q midithru/0
 .Ed