diff --git a/Developers-Guide.md b/Developers-Guide.md
index 96761b9..10c8813 100644
--- a/Developers-Guide.md
+++ b/Developers-Guide.md
@@ -2,6 +2,10 @@
 
 ### Frontend
 
+#### Tools used
+
+- [graphql-codegen](https://github.com/dotansimha/graphql-code-generator) for generating typescript types from graphql queries
+
 
 #### Directory structure
 
@@ -30,6 +34,11 @@ src/
 
 ### Backend
 
+#### Tools used
+
+- [sqlc](https://github.com/kyleconroy/sqlc) for converting SQL query files into Golang code
+- [gqlgen](https://github.com/99designs/gqlgen) for converting graphql schema files into Golang code
+
 #### Architecture
 
 ```
@@ -57,4 +66,17 @@ internal/ # all business logic lives here
    route.go # builds all of the routes
 migrations/ # a directory of database schema migrations
 
-```
\ No newline at end of file
+```
+
+#### GraphQL schemas
+
+The schema for the API lives as multiple files in the `internal/graph/schema/` folder.
+
+The are converted into a single file (because gqlgen wants that) by a mage target `backend:genSchema`
+
+All primary models live in `_models.gql`
+
+The root Query and Mutation objects live in `_root.gql`
+
+The rest of the files contain domain specific declarations. For instance the Mutations
+for interacting with tasks is in the `task.gql` file.
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