diff --git a/docs/api-docs/storefront/graphql/graphql-api-overview.mdx b/docs/api-docs/storefront/graphql/graphql-api-overview.mdx
index 411f31867..d94c4398d 100644
--- a/docs/api-docs/storefront/graphql/graphql-api-overview.mdx
+++ b/docs/api-docs/storefront/graphql/graphql-api-overview.mdx
@@ -207,7 +207,11 @@ curl 'https://store.com/graphql' -H 'authorization: Bearer TOKEN_GOES_HERE' -H '
 
 ### Customer login
 
-If you're using the GraphQL Storefront API from a browser, for example, on top of your Stencil storefront, you can use the Customer Login mutation to sign in to a customer account with an email address and a password. This will set a session cookie in the browser, which will authenticate the customer account on future requests:
+If you're using the GraphQL Storefront API from a browser, for example, on top of your Stencil storefront, you can use the Customer Login mutation to sign in to a customer account with an email address and a password. This will set a session cookie in the browser, which will authenticate the customer account on future requests.
+
+<Callout type="info">
+A customer can only sign in to their account on one device. When running the customer login mutation for a session on a new device, a customer is automatically signed out.
+</Callout>
 
 ```graphql filename="Example query: login mutation" showLineNumbers copy
 mutation Login($email: String!, $pass: String!) {