diff --git a/README.md b/README.md
index 7c1796c..324365c 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ Super fast incremental analysis! Scans `all-packages.nix` in less than 0.1s and
   - Syntax errors. 
     - Incomplete syntax errors are currently suppressed to avoid noisy outputs during typing.
   - [x] Hard semantic errors reported as parse errors by Nix, like duplicated keys in attrsets.
+  - [x] Warnings of legacy syntax.
   - [ ] Client pulled diagnostics.
 - [ ] Cross-file analysis.
 - [ ] Multi-threaded.