--- old/doc/testing.md	2019-04-15 11:11:06.903920111 +0800
+++ new/doc/testing.md	2019-04-15 11:11:06.489859690 +0800
@@ -388,6 +388,13 @@
 
     $ make test TEST="jtreg:test/hotspot/jtreg/containers/docker" JTREG="JAVA_OPTIONS=-Djdk.test.docker.image.name=ubuntu -Djdk.test.docker.image.version=latest"
 
+### Non-English locale just for Linux
+
+If your locale is non-English and when you "make test", it will appear some fail caused by the locale that non-English.
+Then you can try to solve this problem by setting LANG before "make test".
+
+    $ export LANG="en_US"
+
 ---
 # Override some definitions in the global css file that are not optimal for
 # this document.