diff --git a/doc/README.txt b/doc/README.txt
new file mode 100644
index 00000000..c848c50d
--- /dev/null
+++ b/doc/README.txt
@@ -0,0 +1,2 @@
+OSDK document:
+https://developer.dji.com/onboard-sdk/documentation/introduction/homepage.html
\ No newline at end of file