diff --git a/scripts/build.sh b/scripts/build.sh
index 89679883..0116fac0 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -42,6 +42,7 @@ make clean
 make html
 
 retval=$?
+echo "result = $retval"
 if [ $retval -ne 0 ]; then
   echo "make html is error"
   exit 1