diff --git a/man/rules/meson.build b/man/rules/meson.build
index 6d47f09f48f..e459697221e 100644
--- a/man/rules/meson.build
+++ b/man/rules/meson.build
@@ -1,4 +1,6 @@
 # Do not edit. Generated by make-man-rules.py.
+# Update with:
+#     ninja -C build man/update-man-rules
 manpages = [
 ['binfmt.d', '5', [], 'ENABLE_BINFMT'],
  ['bootctl', '1', [], 'ENABLE_EFI'],
diff --git a/tools/make-man-rules.py b/tools/make-man-rules.py
index c4551c6f61d..d86afcbc15a 100755
--- a/tools/make-man-rules.py
+++ b/tools/make-man-rules.py
@@ -51,6 +51,8 @@ def mjoin(files):
 
 MESON_HEADER = '''\
 # Do not edit. Generated by make-man-rules.py.
+# Update with:
+#     ninja -C build man/update-man-rules
 manpages = ['''
 
 MESON_FOOTER = '''\