--- a/js/src/gc/GC.h
+++ b/js/src/gc/GC.h
@@ -159,20 +159,21 @@ static inline void
 VerifyBarriers(JSRuntime* rt, VerifierType type) {}
 
 static inline void
 MaybeVerifyBarriers(JSContext* cx, bool always = false) {}
 
 #endif
 
 /*
- * Instances of this class set the |JSRuntime::suppressGC| flag for the duration
- * that they are live. Use of this class is highly discouraged. Please carefully
- * read the comment in vm/Runtime.h above |suppressGC| and take all appropriate
- * precautions before instantiating this class.
+ * Instances of this class prevent GC while they are live by updating the
+ * |JSContext::suppressGC| counter. Use of this class is highly
+ * discouraged. Please carefully read the comment in vm/JSContext.h above
+ * |suppressGC| and take all appropriate precautions before instantiating this
+ * class.
  */
 class MOZ_RAII JS_HAZ_GC_SUPPRESSED AutoSuppressGC
 {
     int32_t& suppressGC_;
 
   public:
     explicit AutoSuppressGC(JSContext* cx);