diff --git a/AppSync/_AppSync.md b/AppSync/_AppSync.md
index b49109d..3261b46 100644
--- a/AppSync/_AppSync.md
+++ b/AppSync/_AppSync.md
@@ -1,6 +1,44 @@
 # AppSync
 AppSync is a fully managed [[GraphQL|GraphQL]] service.
 
+Notes:
+- It can support real-time APIs via Graph GraphQL subscriptions.
+- AppSync supports custom domains
+- AppSync has a query editor built into the UI
+
 ## Resolvers
 Resolvers attached to specific fields within your types in your schema. used to implement the state-changing operations for your query, mutation, and subscription field operations.
 
+Runtimes:
+- **`APPSYNC_JS`**: JavaScript
+- **VTL**: Velocity Template Language.
+
+## Data Sources
+Where data is being pulled from.
+
+- DynamoDB Table
+- Amazon OpenSearch
+- AWS Lambda Function
+- HTTP Endpoint
+- Amazon EventBridge
+- Relational Database (RDS HTTP Endpoint)
+
+## API Types
+- **GraphQL APIs** - single API from multiple data sources
+- **Merged APIs** - a collection of Graph APIs that act as one API
+    - Useful if you have multiple teams that manage their own API but you want to treat all the APIs as a single API.
+ 
+## Caching Options
+- **None**: Self explanatory; no caching, resolvers will always fetch from data sources.
+- **Full request caching**: Self explanatory; caches all requests.
+- **Per-resolver caching**: specific operation or field defined in a resolver will return responses from the cache.
+Caching isn't serverless; you must provision an on-demand instance.
+
+# Authorisation
+- API Key
+- AWS IAM
+- Cognito User Pools
+
+
+
+