diff --git a/clang/lib/Sema/SemaConcept.cpp b/clang/lib/Sema/SemaConcept.cpp
index 4ec37a94089b..261f57e4d185 100644
--- a/clang/lib/Sema/SemaConcept.cpp
+++ b/clang/lib/Sema/SemaConcept.cpp
@@ -341,7 +341,7 @@ bool Sema::CheckConstraintSatisfaction(
   OutSatisfaction = *Satisfaction;
   // We cannot use InsertPos here because CheckConstraintSatisfaction might have
   // invalidated it.
-  // FIXME: this leaks memory, we should allocate in the arena instead.
+  // Note that entries of SatisfactionCache are deleted in Sema's destructor.
   SatisfactionCache.InsertNode(Satisfaction.release());
   return false;
 }