diff --git a/src/util-inl.h b/src/util-inl.h
index 86e6aaaec9c74a..9dd61a98933685 100644
--- a/src/util-inl.h
+++ b/src/util-inl.h
@@ -501,7 +501,7 @@ void ArrayBufferViewContents<T, S>::ReadValue(v8::Local<v8::Value> buf) {
   }
 }
 
-// ECMA262 20.1.2.5
+// ECMA-262, 15th edition, 21.1.2.5. Number.isSafeInteger
 inline bool IsSafeJsInt(v8::Local<v8::Value> v) {
   if (!v->IsNumber()) return false;
   double v_d = v.As<v8::Number>()->Value();
diff --git a/src/util.h b/src/util.h
index 1bb352537d6e51..93a79f8761ee65 100644
--- a/src/util.h
+++ b/src/util.h
@@ -215,7 +215,7 @@ void DumpJavaScriptBacktrace(FILE* fp);
 #define UNREACHABLE(...)                                                      \
   ERROR_AND_ABORT("Unreachable code reached" __VA_OPT__(": ") __VA_ARGS__)
 
-// ECMA262 20.1.2.6 Number.MAX_SAFE_INTEGER (2^53-1)
+// ECMA-262, 15th edition, 21.1.2.6. Number.MAX_SAFE_INTEGER (2^53-1)
 constexpr int64_t kMaxSafeJsInteger = 9007199254740991;
 
 inline bool IsSafeJsInt(v8::Local<v8::Value> v);