diff --git a/projects/llvm/project.yaml b/projects/llvm/project.yaml
index ad16821ff..ebeaad91a 100644
--- a/projects/llvm/project.yaml
+++ b/projects/llvm/project.yaml
@@ -6,9 +6,10 @@ auto_ccs:
   - "vsk@apple.com"
   - "llvm-bugs@lists.llvm.org"
 
-# TODO(kcc): enable other sanitizers.
+# TODO(kcc): enable msan.
 sanitizers:
   - address
+  - undefined
 
 # The LLVM build currently supports only libFuzzer
 fuzzing_engines: