diff --git a/lib/Frontend/AnalysisConsumer.cpp b/lib/Frontend/AnalysisConsumer.cpp
index a2c93e5..a74bbc2 100644
--- a/lib/Frontend/AnalysisConsumer.cpp
+++ b/lib/Frontend/AnalysisConsumer.cpp
@@ -268,7 +268,8 @@
 
   // Explicitly destroy the PathDiagnosticClient.  This will flush its output.
   // FIXME: This should be replaced with something that doesn't rely on
-  // side-effects in PathDiagnosticClient's destructor.
+  // side-effects in PathDiagnosticClient's destructor. This is required when
+  // used with option -disable-free.
   Mgr.reset(NULL);
 }