diff --git a/README.md b/README.md
index bfecf46..710563e 100644
--- a/README.md
+++ b/README.md
@@ -210,6 +210,8 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 
 ## Checkout multiple repos (nested)
 
+Note: the checkout order must be primary _then_ secondary repo checkout.
+
 ```yaml
 - name: Checkout
   uses: actions/checkout@v4
@@ -224,6 +226,8 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 
 ## Checkout multiple repos (private)
 
+Note: the checkout order must be primary _then_ secondary repo checkout.
+
 ```yaml
 - name: Checkout
   uses: actions/checkout@v4