diff --git a/man5/proc.5 b/man5/proc.5
index 46d603f28..3e5b91af0 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -2020,6 +2020,7 @@ encoded using the following two-letter codes:
     ht  - area uses huge tlb pages
     nl  - non-linear mapping
     ar  - architecture specific flag
+    wf  - wipe on fork
     dd  - do not include area into core dump
     sd  - soft-dirty flag
     mm  - mixed map area