diff --git a/docs/index.md b/docs/index.md
index 47b277bd0..28a0a755c 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -8,8 +8,8 @@ This document is for central government developers and technical architects who
     * [Authenticate requests](#AuthRequests)
     * [JSON Web Tokens: claims](#JWT_claims)
     * [API client libraries](#client_libraries)
-* [test_integ](#Testing your integration with GOV.UK Notify)
-    * [API_keys](#API keys)
+* [Testing your integration with GOV.UK Notify](#test_integ)
+    * [API keys](#API_keys)
 * [API endpoints](#API_endpoints)
     * [Send notifications: POST](#sendnotifications)
     * [Retrieve notifications: GET](#getnotifications)
@@ -121,10 +121,11 @@ You don’t need different service accounts or environments. Instead, there are
 
 <h3 id="API_keys">API keys</h3>
 
-The types of API key that you can create within GOV.UK Notify are:
+The 3 types of API key that you can create within GOV.UK Notify are:
 
 * normal key
 * team key
+* team key
 
 <h4 id="normal_keys">Normal keys</h3>
 
@@ -141,13 +142,31 @@ Don’t use your normal key for automated testing.
 
 <h4 id="team_keys">Team keys</h3>
 
-Use a team key for end-to-end functional testing.
+Use team keys for end-to-end functional testing.
 
 A team key lets you send real messages to members of your team. You get an error if you try to send messages to anyone else.
 
 Messages sent with a team key show up on your dashboard and count against your text message and email allowances.
 
 
+<h4 id="test_keys">Test keys</h3>
+
+Use test keys to test the performance of your service and its integration with GOV.UK Notify under load.
+
+Test keys don’t send real messages but generate realistic responses. There’s no restriction on who you can send to or how many messages you can send per day.
+
+Messages sent using a test key don’t show up on your dashboard or count against your text message and email allowances.
+
+<h4 id="summary_keys">GOV.UK Notify API keys</h3> 
+
+Sends real messages? | Appears in activity and statistics? | Daily service limit
+--- | --- | ---
+Normal key | Yes | Yes | 50 (trial) Unlimited (live)
+Team key | Yes (only team members) | Yes | 50 (trial) Unlimited (live)
+Test key | No | No | Unlimited
+
+
+
 <h2 id="API_endpoints">API endpoints</h2>
 
 You can use the GOV.UK Notify API to: