--- old/doc/testing.md	2019-04-16 16:03:59.410693657 +0800
+++ new/doc/testing.md	2019-04-16 16:03:58.949758252 +0800
@@ -388,6 +388,16 @@
 
     $ 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-US locale
+
+If your locale is non-US, some tests are likely to fail. To work around this you can
+set the locale to US. On Unix platforms simply setting `LANG=en_US` in the
+environment before running tests should work. On Windows, setting
+`JTREG="VM_OPTIONS=-Duser.language=en -Duser.country=US"` helps for most, but not all test cases.
+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.