diff --git a/man5/proc.5 b/man5/proc.5
index b6bd264dd..c2b7af052 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -472,6 +472,9 @@ Real-time scheduling priority (see
 \fIpolicy\fP %lu (since kernel 2.5.19)
 Scheduling policy (see
 .BR sched_setscheduler (2)).
+.TP
+\fIdelayacct_blkio_ticks\fP (since kernel 2.6.18)
+Aggregated block I/O delays (measured in clock ticks (centiseconds)).
 .RE
 .TP
 .I /proc/[number]/statm