diff --git a/info/mktop.pl b/info/mktop.pl
index 9ee73079..c353c85d 100644
--- a/info/mktop.pl
+++ b/info/mktop.pl
@@ -50,6 +50,7 @@ for (@ARGV) {
 open(TOP, ">$out")
     or die "Can't open $out: $!";
 print TOP <<EOF;
+.\\\" DO NOT EDIT THIS FILE.  It was automatically generated by mktop.pl
 .TH Info "List of Subjects"
 .s1
 Empire info is available on the following subjects: