walk(1): add history section

diff --git a/sys/man/1/walk b/sys/man/1/walk
index 74d24b3710a248db4500a91a314d8be156862cd1..ecb6522a8f3da1208dee125cc889fc0e6ad1604c 100644 (file)
--- a/sys/man/1/walk
+++ b/sys/man/1/walk
@@ -120,3 +120,6 @@ Manipulating ifs is a nuisance.
 File names are assumed to not contain newlines.
 .PP
 Correct invocation requires too much thought.
+.SH HISTORY
+.I Walk
+first appeared in 9front (March, 2019).