diff --git a/man5/proc.5 b/man5/proc.5
index 3d3a50a19..78ff38171 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -2430,6 +2430,9 @@ setting individually with the
 .BR prctl (2)
 .B PR_MCE_KILL
 operation.
+.IP
+Only present if the kernel was configured with
+.BR CONFIG_MEMORY_FAILURE .
 .TP
 .IR /proc/sys/vm/memory_failure_recovery " (since Linux 2.6.32)"
 .\" The following is based on the text in Documentation/sysctl/vm.txt
@@ -2440,6 +2443,9 @@ Attempt recovery.
 .IP 0: 4
 Always panic on a memory failure.
 .RE
+.IP
+Only present if the kernel was configured with
+.BR CONFIG_MEMORY_FAILURE .
 .TP
 .IR /proc/sys/vm/oom_dump_tasks " (since Linux 2.6.25)"
 .\" The following is from Documentation/sysctl/vm.txt