diff --git a/backend/src/core/CLAUDE.md b/backend/src/core/CLAUDE.md
index 8b25831..a8fd0bd 100644
--- a/backend/src/core/CLAUDE.md
+++ b/backend/src/core/CLAUDE.md
@@ -11,7 +11,7 @@
 | Directory | What | When to read |
 | --------- | ---- | ------------ |
 | `auth/` | Authentication utilities | JWT handling, user context |
-| `config/` | Configuration loading (env, database, redis) | Environment setup, connection pools |
+| `config/` | Configuration loading (env, database, redis) and feature tier gating (fuelLog.receiptScan, document.scanMaintenanceSchedule, vehicle.vinDecode) | Environment setup, connection pools, tier requirements |
 | `logging/` | Winston structured logging | Log configuration, debugging |
 | `middleware/` | Fastify middleware | Request processing, user extraction |
 | `plugins/` | Fastify plugins (auth, error, logging, tier guard) | Plugin registration, hooks, tier gating |
diff --git a/backend/src/features/ocr/README.md b/backend/src/features/ocr/README.md
index 83b4d65..b601f48 100644
--- a/backend/src/features/ocr/README.md
+++ b/backend/src/features/ocr/README.md
@@ -8,7 +8,7 @@ Backend proxy for the Python OCR microservice. Handles authentication, tier gati
 |--------|----------|-------------|------|------|----------|
 | POST | `/api/ocr/extract` | Synchronous general OCR extraction | Required | - | 10MB |
 | POST | `/api/ocr/extract/vin` | VIN-specific extraction | Required | - | 10MB |
-| POST | `/api/ocr/extract/receipt` | Fuel receipt extraction | Required | - | 10MB |
+| POST | `/api/ocr/extract/receipt` | Fuel receipt extraction | Required | Pro | 10MB |
 | POST | `/api/ocr/extract/manual` | Async maintenance manual extraction | Required | Pro | 200MB |
 | POST | `/api/ocr/jobs` | Submit async OCR job | Required | - | 200MB |
 | GET | `/api/ocr/jobs/:jobId` | Poll async job status | Required | - | - |
@@ -177,4 +177,4 @@ The backend proxy translates Python service error codes:
 
 Manual extraction requires Pro tier. The tier guard middleware (`requireTier` plugin) validates the user's subscription tier before processing. Free-tier users receive HTTP 403 with `TIER_REQUIRED` error code and an upgrade prompt.
 
-Receipt and VIN extraction are available to all tiers.
+VIN extraction is available to all tiers. Receipt extraction requires Pro tier (`fuelLog.receiptScan`).