diff --git a/sys/man/1/walk b/sys/man/1/walk
index f8e7a75e2..2d1dd4365 100644
--- a/sys/man/1/walk
+++ b/sys/man/1/walk
@@ -47,6 +47,10 @@ Both
 and
 .I max
 are optional.
+A number
+.I n
+with no comma is equivalne to
+.IR 0,n .
 .TP
 .B -e statfmt
 Setting the statfmt string allows specifying the data