diff --git a/src/mrt/README b/src/mrt/README
new file mode 100644
index 0000000000000000000000000000000000000000..016e8e0f60f8676415e5fe440153c959245c1fb1
--- /dev/null
+++ b/src/mrt/README
@@ -0,0 +1 @@
+for java runtime source code & platform-rt binary