diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 20c6cbe..d879076 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -9345,9 +9345,11 @@
   while (NumParams--)
     Params.push_back(ReadDeclAs<NamedDecl>(F, Record, Idx));
 
-  // TODO: Concepts
+  bool HasRequiresClause = Record[Idx++];
+  Expr *RequiresClause = HasRequiresClause ? ReadExpr(F) : nullptr;
+
   TemplateParameterList *TemplateParams = TemplateParameterList::Create(
-      getContext(), TemplateLoc, LAngleLoc, Params, RAngleLoc, nullptr);
+      getContext(), TemplateLoc, LAngleLoc, Params, RAngleLoc, RequiresClause);
   return TemplateParams;
 }