diff --git a/README.md b/README.md
index 7c5728f..ce50a3c 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ Need to look up the API documentation for a product? There's a repo for each:
 
 * [Basecamp Classic API](https://github.com/basecamp/basecamp-classic-api)
 * [Basecamp 2 API](https://github.com/basecamp/bcx-api)
-* [Basecamp 3 API](https://github.com/basecamp/bc3-api)
+* [Basecamp 4 API](https://github.com/basecamp/bc3-api)
 
 Authentication
 --------------
diff --git a/sections/authentication.md b/sections/authentication.md
index df497a4..f93d9c0 100644
--- a/sections/authentication.md
+++ b/sections/authentication.md
@@ -145,7 +145,7 @@ So you've picked the product, have the `href` to request to, and now what? Depen
 
 Here are links to the endpoints in our products that you'll need to hit:
 
-* [Basecamp 3: Get person](https://github.com/basecamp/bc3-api/blob/master/sections/people.md#get-person)
+* [Basecamp 4: Get person](https://github.com/basecamp/bc3-api/blob/master/sections/people.md#get-person)
 * [Basecamp 2: Get person](https://github.com/basecamp/bcx-api/blob/master/sections/people.md#get-person)
 * [Basecamp Classic: Current person](https://github.com/basecamp/basecamp-classic-api/blob/master/sections/people.md#current-person)
 * [Highrise: Get myself](https://github.com/basecamp/highrise-api/blob/master/sections/users.md#get-myself)