diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index 7ba64e3..8091d68 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -85,6 +85,14 @@
       return NULL;
   }
 
+  if (const ClassTemplateSpecializationDecl *CTSD =
+          dyn_cast<ClassTemplateSpecializationDecl>(D)) {
+    TemplateSpecializationKind TSK = CTSD->getSpecializationKind();
+    if (TSK == TSK_ImplicitInstantiation ||
+        TSK == TSK_Undeclared)
+      return NULL;
+  }
+
   if (const EnumDecl *ED = dyn_cast<EnumDecl>(D)) {
     if (ED->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
       return NULL;
@@ -428,12 +436,12 @@
           return cloneFullComment(FC, D);
     }
     else if (const TypedefDecl *TD = dyn_cast<TypedefDecl>(D)) {
-      // Attach enum's documentation to its typedef if latter
+      // Attach any tag type's documentation to its typedef if latter
       // does not have one of its own.
       QualType QT = TD->getUnderlyingType();
-      if (const EnumType *ET = QT->getAs<EnumType>())
-        if (const EnumDecl *ED = ET->getDecl())
-          if (comments::FullComment *FC = getCommentForDecl(ED, PP))
+      if (const TagType *TT = QT->getAs<TagType>())
+        if (const Decl *TD = TT->getDecl())
+          if (comments::FullComment *FC = getCommentForDecl(TD, PP))
             return cloneFullComment(FC, D);
     }
     return NULL;
diff --git a/test/Index/annotate-comments-typedef.m b/test/Index/annotate-comments-typedef.m
index 6e5fb73..4c2b62b 100644
--- a/test/Index/annotate-comments-typedef.m
+++ b/test/Index/annotate-comments-typedef.m
@@ -27,4 +27,23 @@
         E_MyEnumBaz, /**< value Baz */
 };
 typedef enum E E_T;
-// CHECK: TypedefDecl=E_T:[[@LINE-1]]:16 (Definition) FullCommentAsHTML=[<p class="para-brief"> Documentation for E </p>] FullCommentAsXML=[<Typedef file="{{[^"]+}}annotate-comments-typedef.m" line="[[@LINE-1]]" column="16"><Name>E</Name><USR>c:@E@E</USR><Declaration>typedef enum E E_T</Declaration><Abstract><Para> Documentation for E </Para></Abstract></Typedef>]
+// CHECK: EnumDecl=E:[[@LINE-6]]:6 (Definition) {{.*}} BriefComment=[Documentation for E] FullCommentAsHTML=[<p class="para-brief"> Documentation for E </p>] FullCommentAsXML=[<Enum file="{{[^"]+}}annotate-comments-typedef.m" line="[[@LINE-6]]" column="6"><Name>E</Name><USR>c:@E@E</USR><Declaration>enum E {}</Declaration><Abstract><Para> Documentation for E </Para></Abstract></Enum>]
+// CHECK: TypedefDecl=E_T:[[@LINE-2]]:16 (Definition) FullCommentAsHTML=[<p class="para-brief"> Documentation for E </p>] FullCommentAsXML=[<Typedef file="{{[^"]+}}annotate-comments-typedef.m" line="[[@LINE-2]]" column="16"><Name>E</Name><USR>c:@E@E</USR><Declaration>typedef enum E E_T</Declaration><Abstract><Para> Documentation for E </Para></Abstract></Typedef>]
+
+
+/** Comment about Foo */
+typedef struct {
+         int iii;
+        } Foo;
+// CHECK: TypedefDecl=Foo:[[@LINE-1]]:11 (Definition) FullCommentAsHTML=[<p class="para-brief"> Comment about Foo </p>] FullCommentAsXML=[<Typedef file="{{[^"]+}}annotate-comments-typedef.m" line="[[@LINE-1]]" column="11"><Name>&lt;anonymous&gt;</Name><USR>c:@SA@Foo</USR><Declaration>typedef struct Foo Foo</Declaration><Abstract><Para> Comment about Foo </Para></Abstract></Typedef>]
+// CHECK: StructDecl=:[[@LINE-4]]:9 (Definition) {{.*}} BriefComment=[Comment about Foo] FullCommentAsHTML=[<p class="para-brief"> Comment about Foo </p>] FullCommentAsXML=[<Class file="{{[^"]+}}annotate-comments-typedef.m" line="[[@LINE-4]]" column="9"><Name>&lt;anonymous&gt;</Name><USR>c:@SA@Foo</USR><Declaration>struct {}</Declaration><Abstract><Para> Comment about Foo </Para></Abstract></Class>]
+
+
+struct Foo1 {
+  int iii;
+};
+/** About Foo1T */
+typedef struct Foo1 Foo1T;
+// FIXME: we don't attach this comment to 'struct Foo1'
+// CHECK: TypedefDecl=Foo1T:[[@LINE-2]]:21 (Definition) {{.*}} FullCommentAsHTML=[<p class="para-brief"> About Foo1T </p>] FullCommentAsXML=[<Typedef file="{{[^"]+}}annotate-comments-typedef.m" line="[[@LINE-2]]" column="21"><Name>Foo1T</Name><USR>c:annotate-comments-typedef.m@{{[0-9]+}}@T@Foo1T</USR><Declaration>typedef struct Foo1 Foo1T</Declaration><Abstract><Para> About Foo1T </Para></Abstract></Typedef>]
+
diff --git a/test/Sema/warn-documentation.cpp b/test/Sema/warn-documentation.cpp
index 6a6b8dd..9845f58 100644
--- a/test/Sema/warn-documentation.cpp
+++ b/test/Sema/warn-documentation.cpp
@@ -377,6 +377,29 @@
 template<typename T>
 using test_tparam15 = test_tparam13<T, int>;
 
+// ----
+
+/// \tparam T Aaa
+template<typename T>
+class test_tparam16 { };
+
+typedef test_tparam16<int> test_tparam17;
+typedef test_tparam16<double> test_tparam18;
+
+// ----
+
+template<typename T>
+class test_tparam19;
+
+typedef test_tparam19<int> test_tparam20;
+typedef test_tparam19<double> test_tparam21;
+
+/// \tparam T Aaa
+template<typename T>
+class test_tparam19 { };
+
+// ----
+
 
 /// Aaa
 /// \deprecated Bbb