spirv-fuzz: Fix comments #4215

Related to #4214.
diff --git a/source/fuzz/fuzzer.cpp b/source/fuzz/fuzzer.cpp
index f646069..9d1af75 100644
--- a/source/fuzz/fuzzer.cpp
+++ b/source/fuzz/fuzzer.cpp
@@ -229,7 +229,9 @@
   MaybeAddFinalPass<FuzzerPassAdjustSelectionControls>(&final_passes_);
   MaybeAddFinalPass<FuzzerPassAddNoContractionDecorations>(&final_passes_);
   if (!fuzzer_context_->IsWgslCompatible()) {
-    // Signedness is not as interchangeable in WGSL as in SPIR-V.
+    // TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/4214):
+    //  this is disabled temporarily due to some issues in the Tint compiler.
+    //  Enable it back when the issues are resolved.
     MaybeAddFinalPass<FuzzerPassInterchangeSignednessOfIntegerOperands>(
         &final_passes_);
   }