diff --git a/iosnoop b/iosnoop
index c5de4e3..445c92c 100755
--- a/iosnoop
+++ b/iosnoop
@@ -206,7 +206,7 @@ if ! echo 1 > events/block/$b_start/enable || \
 fi
 (( opt_start )) && printf "%-14s " "STARTs"
 (( opt_end )) && printf "%-14s " "ENDs"
-printf "%-16.16s %-6s %-4s %-8s %-12s %-6s %8s\n" \
+printf "%-12.12s %-6s %-4s %-8s %-12s %-6s %8s\n" \
     "COMM" "PID" "TYPE" "DEV" "BLOCK" "BYTES" "LATms"
 
 #
@@ -277,7 +277,7 @@ fi ) | $awk -v o=$offset -v opt_name=$opt_name -v name=$name \
 				printf "%-14s ", starts[dev, loc]
 			if (opt_end)
 				printf "%-14s ", time
-			printf "%-16.16s %-6s %-4s %-8s %-12s %-6s %8s\n",
+			printf "%-12.12s %-6s %-4s %-8s %-12s %-6s %8s\n",
 			    comm, pid, dir, dev, loc, nsec * 512, latency
 			if (!opt_duration)
 				fflush()
diff --git a/man/man8/iosnoop.8 b/man/man8/iosnoop.8
index 65aab1e..a9993f3 100644
--- a/man/man8/iosnoop.8
+++ b/man/man8/iosnoop.8
@@ -116,7 +116,7 @@ Trace I/O queued when PID 181 was on-CPU (more accurate), and include queue time
 .TP
 COMM
 Process name (command) for the PID that was on-CPU when the I/O was issued, or
-inserted if \-Q is used. See PID.
+inserted if \-Q is used. See PID. This column is truncated to 12 characters.
 .TP
 PID
 Process ID which was on-CPU when the I/O was issued, or inserted if \-Q is