feature.pl: Mention perl.h as a source

diff --git a/regen/feature.pl b/regen/feature.pl
index 20cfd4f..3badc70 100755 (executable)
--- a/regen/feature.pl
+++ b/regen/feature.pl
@@ -5,7 +5,8 @@
 #    lib/feature.pm
 #    feature.h
 #
-# from information hardcoded into this script.
+# from information hardcoded into this script and from one #define
+# in perl.h.
 #
 # This script is normally invoked from regen.pl.