diff --git a/TODO.md b/TODO.md
index a1f5d59..3354983 100644
--- a/TODO.md
+++ b/TODO.md
@@ -174,10 +174,10 @@ A single linear checklist of tasks to implement the complete pixa caching image
 
 ## HTTP Response Handling
 - [x] Implement proper Cache-Control headers
-- [ ] Implement ETag generation and validation
+- [x] Implement ETag generation and validation
 - [ ] Implement Last-Modified headers
-- [ ] Implement conditional requests (If-None-Match, If-Modified-Since)
-- [ ] Implement HEAD request support
+- [x] Implement conditional requests (If-None-Match, If-Modified-Since)
+- [x] Implement HEAD request support
 - [ ] Implement Vary header for content negotiation
 - [x] Implement X-Pixa-Cache debug header (HIT/MISS/STALE)
 - [ ] Implement X-Request-ID propagation
@@ -185,7 +185,7 @@ A single linear checklist of tasks to implement the complete pixa caching image
 
 ## Additional Endpoints
 - [x] Implement robots.txt endpoint
-- [ ] Implement metrics endpoint with auth
+- [x] Implement metrics endpoint with auth
 - [ ] Implement auto-format selection (format=auto based on Accept header)
 
 ## Configuration