1 files changed, 8 insertions, 2 deletions
diff --git a/lib/Sema/SemaTemplateDeduction.cpp b/lib/Sema/SemaTemplateDeduction.cpp
index 252f2d1d0d..48e38ddf14 100644
--- a/lib/Sema/SemaTemplateDeduction.cpp
+++ b/lib/Sema/SemaTemplateDeduction.cpp
@@ -618,12 +618,18 @@ DeduceTemplateArguments(ASTContext &Context,
   return Sema::TDK_Success;
 }
 
-
+/// \brief Perform template argument deduction to determine whether
+/// the given template arguments match the given class template
+/// partial specialization per C++ [temp.class.spec.match].
 Sema::TemplateDeductionResult
 Sema::DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial,
                               const TemplateArgumentList &TemplateArgs,
                               TemplateDeductionInfo &Info) {
-  // Deduce the template arguments for the partial specialization
+  // C++ [temp.class.spec.match]p2:
+  //   A partial specialization matches a given actual template
+  //   argument list if the template arguments of the partial
+  //   specialization can be deduced from the actual template argument
+  //   list (14.8.2).
   llvm::SmallVector<TemplateArgument, 4> Deduced;
   Deduced.resize(Partial->getTemplateParameters()->size());
   if (TemplateDeductionResult Result