diff --git a/docs/content/tutorial/2-adding-custom-functionality.md b/docs/content/tutorial/2-adding-custom-functionality.md
index cc0d02d652..e04d84303a 100644
--- a/docs/content/tutorial/2-adding-custom-functionality.md
+++ b/docs/content/tutorial/2-adding-custom-functionality.md
@@ -56,7 +56,7 @@ In the constructor we specify that our `WelcomeService` will depend upon the `ca
 
 ### `registerOptin`
 
-The `registerOption` function will take to arguments: `cartId` and `optin`, where `cartId` holds the id of the cart that we wish to register optin for and `optin` is a boolean to indicate if the customer has accepted or optin or not. We will save the `optin` preferences in the cart's `metadata` field, so that it can be persisted for the future when we need to evaluate if we should send the welcome or not.
+The `registerOption` function will take two arguments: `cartId` and `optin`, where `cartId` holds the id of the cart that we wish to register optin for and `optin` is a boolean to indicate if the customer has accepted or optin or not. We will save the `optin` preferences in the cart's `metadata` field, so that it can be persisted for the future when we need to evaluate if we should send the welcome or not.
 
 ```javascript
 async registerOptin(cartId, optin) {