diff --git a/trunk/auto/options.sh b/trunk/auto/options.sh
index 5135b79b9..8d943fd38 100755
--- a/trunk/auto/options.sh
+++ b/trunk/auto/options.sh
@@ -1,7 +1,6 @@
 #!/bin/bash
 
 # variables, parent script must set it:
-# SRS_AUTO_HEADERS_H: the auto generated header file.
 
 #####################################################################################
 #####################################################################################
diff --git a/trunk/configure b/trunk/configure
index 2b5fd89e6..35523450e 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -30,6 +30,7 @@ if [[ -f Makefile ]]; then
 fi
 
 # write user options to headers
+echo "// auto generated by configure" > $SRS_AUTO_HEADERS_H
 echo "#ifndef SRS_AUTO_HEADER_HPP" >> $SRS_AUTO_HEADERS_H
 echo "#define SRS_AUTO_HEADER_HPP" >> $SRS_AUTO_HEADERS_H
 echo "" >> $SRS_AUTO_HEADERS_H