diff --git a/src/hotspot/share/oops/klass.hpp b/src/hotspot/share/oops/klass.hpp
index efeeb17..57b5737 100644
--- a/src/hotspot/share/oops/klass.hpp
+++ b/src/hotspot/share/oops/klass.hpp
@@ -656,7 +656,8 @@ protected:
   virtual MetaspaceObj::Type type() const { return ClassType; }
 
   // Iff the class loader (or mirror for unsafe anonymous classes) is alive the
-  // Klass is considered alive.  Has already been marked as unloading.
+  // Klass is considered alive. This is safe to call before the CLD is marked as
+  // unloading, and hence during concurrent class unloading.
   bool is_loader_alive() const { return class_loader_data()->is_alive(); }
 
   // Load the klass's holder as a phantom. This is useful when a weak Klass