diff --git a/GNUmakefile b/GNUmakefile
index da2462f..3fbdde5 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -72,7 +72,7 @@ TAI_OBJS=$(patsubst tai/%.c,%.o,$(wildcard tai/*.c))
 TAIA_OBJS=$(patsubst taia/%.c,%.o,$(wildcard taia/*.c))
 DNS_OBJS=$(patsubst dns/%.c,%.o,$(wildcard dns/*.c))
 CASE_OBJS=$(patsubst case/%.c,%.o,$(wildcard case/*.c))
-ARRAY_OBJS=$(patsubst array/%.c,%.o,$(wildcard array/*.c))
+ARRAY_OBJS=$(patsubst array/%.c,%.o,$(wildcard array/array_*.c))
 MULT_OBJS=$(patsubst mult/%.c,%.o,$(wildcard mult/*.c))
 IO_OBJS=$(patsubst io/%.c,%.o,$(wildcard io/*.c))
 CDB_OBJS=$(patsubst cdb/%.c,%.o,$(wildcard cdb/*.c))
diff --git a/io/iob_addbuf.3 b/io/iob_addbuf.3
index c1475ee..8f96320 100644
--- a/io/iob_addbuf.3
+++ b/io/iob_addbuf.3
@@ -4,12 +4,14 @@ iob_addbuf \- add buffer to I/O batch
 .SH SYNTAX
 .B #include <iob.h>
 
-void \fBiob_addbuf\fP(io_batch* b,const void* buf,uint64 n);
+int \fBiob_addbuf\fP(io_batch* b,const void* buf,uint64 n);
 .SH DESCRIPTION
 iob_addbuf schedules \fIn\fR bytes starting at \fIbuf\fR to be written
 with the I/O batch \fIb\fR.
 
 Use \fBiob_addbuf_free\fR if you want the buffer to be deallocated
 automatically by \fBiob_reset\fR.
+.SH "RETURN VALUE"
+Returns 1 on success, 0 on failure.
 .SH "SEE ALSO"
 iob_reset(3), iob_send(3), iob_addbuf_free(3), iob_adds(3), iob_addfile(3)
diff --git a/io/iob_addbuf_free.3 b/io/iob_addbuf_free.3
index ce32791..9c3b598 100644
--- a/io/iob_addbuf_free.3
+++ b/io/iob_addbuf_free.3
@@ -4,11 +4,14 @@ iob_addbuf_free \- add buffer to I/O batch, with deallocation
 .SH SYNTAX
 .B #include <iob.h>
 
-void \fBiob_addbuf_free\fP(io_batch* b,const void* buf,uint64 n);
+int \fBiob_addbuf_free\fP(io_batch* b,const void* buf,uint64 n);
 .SH DESCRIPTION
 iob_addbuf_free schedules \fIn\fR bytes starting at \fIbuf\fR to be
 written with the I/O batch \fIb\fR.
 
 The buffer will automatically be deallocated by \fBiob_reset\fR.
+.SH "RETURN VALUE"
+Returns 1 if successful, 0 if not.  In the failure case, the buffer was
+deallocated.
 .SH "SEE ALSO"
 iob_reset(3), iob_send(3), iob_addbuf(3), iob_adds(3), iob_addfile(3)
diff --git a/io/iob_addfile.3 b/io/iob_addfile.3
index 4622a88..05cc4bc 100644
--- a/io/iob_addfile.3
+++ b/io/iob_addfile.3
@@ -4,7 +4,7 @@ iob_addfile \- add file region to I/O batch
 .SH SYNTAX
 .B #include <iob.h>
 
-void \fBiob_addfile\fP(io_batch* b,int64 fd,uint64 off,uint64 n);
+int \fBiob_addfile\fP(io_batch* b,int64 fd,uint64 off,uint64 n);
 .SH DESCRIPTION
 iob_addfile schedules \fIn\fR bytes from the file descriptor \fIfd\fR
 starting at offset \fIoff\fR to be written with the I/O batch \fIb\fR.
@@ -13,5 +13,7 @@ You may not close \fIfd\fR before iob_send indicates it is done.
 
 Use \fBiob_addfile_close\fR if you want the file descriptor to be closed
 automatically by \fBiob_reset\fR.
+.SH "RETURN VALUE"
+Returns 1 on success, 0 on failure.
 .SH "SEE ALSO"
 iob_reset(3), iob_send(3), iob_addbuf(3), iob_addfile_close(3)
diff --git a/io/iob_addfile_close.3 b/io/iob_addfile_close.3
index c31333c..ec2ee57 100644
--- a/io/iob_addfile_close.3
+++ b/io/iob_addfile_close.3
@@ -4,7 +4,7 @@ iob_addfile_close \- add file region to I/O batch
 .SH SYNTAX
 .B #include <iob.h>
 
-void \fBiob_addfile_close\fP(io_batch* b,int64 fd,uint64 off,uint64 n);
+int \fBiob_addfile_close\fP(io_batch* b,int64 fd,uint64 off,uint64 n);
 .SH DESCRIPTION
 iob_addfile_close schedules \fIn\fR bytes from the file descriptor \fIfd\fR
 starting at offset \fIoff\fR to be written with the I/O batch \fIb\fR.
@@ -12,5 +12,8 @@ starting at offset \fIoff\fR to be written with the I/O batch \fIb\fR.
 You may not close \fIfd\fR before iob_send indicates it is done.
 
 \fBiob_reset\fR will call io_close(fd).
+.SH "RETURN VALUE"
+Returns 1 on success, 0 on failure.  In the failure case, the file
+descriptor has been closed.
 .SH "SEE ALSO"
 iob_reset(3), iob_send(3), iob_addbuf(3), iob_addfile(3)