diff --git a/README.md b/README.md
index 4d6cbf4..404c300 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,6 @@ GPS fueled ESP32 based NTP Server
 
 GPS: Adafruit Untimate GPS
 
+This project has git submodules so please use --recursive when you clone!  If you forget then run: `git submodule update --init`! After a `git pull` you should run `git submodule update --init --recursive` to make sure submodules are up to date.
+
 Work in progress....