diff --git a/CLAUDE.md b/CLAUDE.md
index 43da804..314bf12 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -44,7 +44,8 @@ word-counter-api/
 
 - **Purpose**: An API service for counting words in text input.
 - **Stack**: Node.js + TypeScript (CommonJS modules, `tsc` build, `tsx` for dev watch).
-- Key design decisions still to make: HTTP framework, authentication strategy, request/response format (REST vs. GraphQL), deployment target.
+- HTTP framework: **Express** (`express` + `@types/express`).
+- Key design decisions still to make: authentication strategy, request/response format (REST vs. GraphQL), deployment target.
 
 ## Code Style