diff --git a/configure b/configure
index 43d1bedc6d..98cf4fa77e 100755
--- a/configure
+++ b/configure
@@ -6221,7 +6221,7 @@ enabled getenv || echo "#define getenv(x) NULL" >> $TMPH
 mkdir -p doc
 mkdir -p tests
 mkdir -p tests/api
-echo "@c auto-generated by configure" > doc/config.texi
+echo "@c auto-generated by configure - do not modify! " > doc/config.texi
 
 print_config ARCH_   "$config_files" $ARCH_LIST
 print_config HAVE_   "$config_files" $HAVE_LIST