diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index c272882..db46967 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -499,6 +499,8 @@
   "detected while default synthesizing properties in class implementation">;
 def note_class_declared : Note<
   "class is declared here">;
+def note_receiver_class_declared : Note<
+  "receiver is object of the class that is declared here">;
 def note_receiver_is_id : Note<
   "receiver is treated with 'id' type for purpose of method lookup">;
 def note_suppressed_class_declare : Note<
diff --git a/lib/Sema/SemaExprObjC.cpp b/lib/Sema/SemaExprObjC.cpp
index d37f61a..7c701ea 100644
--- a/lib/Sema/SemaExprObjC.cpp
+++ b/lib/Sema/SemaExprObjC.cpp
@@ -1221,10 +1221,19 @@
     else
       DiagID = isClassMessage ? diag::warn_class_method_not_found
                               : diag::warn_inst_method_not_found;
-    if (!getLangOpts().DebuggerSupport)
+    if (!getLangOpts().DebuggerSupport) {
       Diag(SelLoc, DiagID)
         << Sel << isClassMessage << SourceRange(SelectorLocs.front(), 
                                                 SelectorLocs.back());
+      // Find the class to which we are sending this message.
+      if (ReceiverType->isObjCObjectPointerType()) {
+        QualType ClassType =
+          ReceiverType->getAs<ObjCObjectPointerType>()->getPointeeType();
+        if (const ObjCObjectType *ClassTPtr = ClassType->getAs<ObjCObjectType>())
+          if (ObjCInterfaceDecl *Class = ClassTPtr->getInterface())
+            Diag(Class->getLocation(), diag::note_receiver_class_declared);
+      }
+    }
 
     // In debuggers, we want to use __unknown_anytype for these
     // results so that clients can cast them.
diff --git a/test/Analysis/inlining/DynDispatchBifurcate.m b/test/Analysis/inlining/DynDispatchBifurcate.m
index ab1dfc5..d8af213 100644
--- a/test/Analysis/inlining/DynDispatchBifurcate.m
+++ b/test/Analysis/inlining/DynDispatchBifurcate.m
@@ -181,11 +181,11 @@
 }
 
 // Test definition not available edge case.
-@interface DefNotAvailClass : NSObject
+@interface DefNotAvailClass : NSObject // expected-note {{receiver is object of the class that is declared here}}
 @end
 id testDefNotAvailableInlined(DefNotAvailClass *C) {
   return [C mem]; // expected-warning {{instance method '-mem' not found}}
 }
 id testDefNotAvailable(DefNotAvailClass *C) {
   return testDefNotAvailableInlined(C);
-}
\ No newline at end of file
+}
diff --git a/test/Analysis/rdar-6540084.m b/test/Analysis/rdar-6540084.m
index 7070709..d93450b 100644
--- a/test/Analysis/rdar-6540084.m
+++ b/test/Analysis/rdar-6540084.m
@@ -9,13 +9,13 @@
 @protocol NSObject  - (BOOL)isEqual:(id)object; @end
 @interface NSObject <NSObject> {} @end
 extern id NSAllocateObject(Class aClass, NSUInteger extraBytes, NSZone *zone);
-@class NSArray;
+@class NSArray; // expected-note {{receiver is object of the class that is declared here}}
 @class NSMutableArray, NSIndexSet, NSView, NSPredicate, NSString, NSViewAnimation, NSTimer; // expected-note{{forward declaration of class here}}
 @interface FooBazController : NSObject {}
 @end
 typedef struct {} TazVersion;
 @class TazNode;
-@interface TazGuttenberg : NSObject {} typedef NSUInteger BugsBunnyType; @end
+@interface TazGuttenberg : NSObject {} typedef NSUInteger BugsBunnyType; @end // expected-note {{receiver is object of the class that is declared here}}
 @interface FooBaz : NSObject {}
 @property (nonatomic) BugsBunnyType matchType;
 @property (nonatomic, retain) NSArray *papyrus; @end
diff --git a/test/Modules/objc-categories.m b/test/Modules/objc-categories.m
index 81fb28b..07d1760 100644
--- a/test/Modules/objc-categories.m
+++ b/test/Modules/objc-categories.m
@@ -10,6 +10,7 @@
 
 // expected-note@Inputs/category_left.h:14 {{previous definition}}
 // expected-warning@Inputs/category_right.h:11 {{duplicate definition of category}}
+// expected-note@Inputs/category_top.h:1 {{receiver is object of the class that is declared here}}
 
 @interface Foo(Source)
 -(void)source; 
diff --git a/test/PCH/chain-categories2.m b/test/PCH/chain-categories2.m
index f230bf9..8cb06a8 100644
--- a/test/PCH/chain-categories2.m
+++ b/test/PCH/chain-categories2.m
@@ -45,6 +45,7 @@
 #else
 //===----------------------------------------------------------------------===//
 
+// expected-note@30 {{receiver is object of the class that is declared here}}
 void f(I* i) {
   [i meth]; // expected-warning {{not found}}
 }
diff --git a/test/SemaObjC/call-super-2.m b/test/SemaObjC/call-super-2.m
index 3c45a2c..18a5f09 100644
--- a/test/SemaObjC/call-super-2.m
+++ b/test/SemaObjC/call-super-2.m
@@ -14,7 +14,7 @@
 - (int) instance_func0;
 @end
 
-@interface Derived: Object
+@interface Derived: Object // expected-note {{receiver is object of the class that is declared here}}
 + (int) class_func1;
 + (int) class_func2;
 + (int) class_func3;
diff --git a/test/SemaObjC/compare-qualified-id.m b/test/SemaObjC/compare-qualified-id.m
index 82868f8..0b7e106 100644
--- a/test/SemaObjC/compare-qualified-id.m
+++ b/test/SemaObjC/compare-qualified-id.m
@@ -12,7 +12,7 @@
 typedef struct {} NSFastEnumerationState;
 @protocol NSFastEnumeration  - (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState *)state objects:(id *)stackbuf count:(NSUInteger)len; @end
 @interface NSDictionary : NSObject <NSCopying, NSMutableCopying, NSCoding, NSFastEnumeration>  - (NSUInteger)count; @end
-@interface NSMutableDictionary : NSDictionary  - (void)removeObjectForKey:(id)aKey; @end
+@interface NSMutableDictionary : NSDictionary  - (void)removeObjectForKey:(id)aKey; @end // expected-note {{receiver is object of the class that is declared here}}
 extern NSString * const NSTaskDidTerminateNotification;
 
 @interface XCPropertyExpansionContext : NSObject <NSCopying> { // expected-note {{required for direct or indirect protocol 'NSCopying'}}
diff --git a/test/SemaObjC/conditional-expr.m b/test/SemaObjC/conditional-expr.m
index ec1305d..0834538 100644
--- a/test/SemaObjC/conditional-expr.m
+++ b/test/SemaObjC/conditional-expr.m
@@ -33,7 +33,8 @@
 @end
 
 // No @interface declaration for DTFilterOutputStream3
-@implementation DTFilterOutputStream3 // expected-warning {{cannot find interface declaration for 'DTFilterOutputStream3'}}
+@implementation DTFilterOutputStream3 // expected-warning {{cannot find interface declaration for 'DTFilterOutputStream3'}} \
+				      // expected-note {{receiver is object of the class that is declared here}}
 - (id)initWithNextOutputStream:(id <DTOutputStreams>) outputStream {
   id <DTOutputStreams> nextOutputStream = [self nextOutputStream]; // expected-warning {{method '-nextOutputStream' not found (return type defaults to 'id')}}
   self = nextOutputStream; // expected-warning {{assigning to 'DTFilterOutputStream3 *' from incompatible type 'id<DTOutputStreams>'}}
diff --git a/test/SemaObjC/error-outof-scope-property-use.m b/test/SemaObjC/error-outof-scope-property-use.m
index c69a405..023687b 100644
--- a/test/SemaObjC/error-outof-scope-property-use.m
+++ b/test/SemaObjC/error-outof-scope-property-use.m
@@ -2,7 +2,7 @@
 // RUN: %clang_cc1 -x objective-c++ -fsyntax-only -fobjc-default-synthesize-properties -verify -Wno-objc-root-class %s
 // rdar://13178483
 
-@class NSMutableDictionary;
+@class NSMutableDictionary; // expected-note {{receiver is object of the class that is declared here}}
 
 @interface LaunchdJobs 
 
diff --git a/test/SemaObjC/instancetype.m b/test/SemaObjC/instancetype.m
index 8137964..2374890 100644
--- a/test/SemaObjC/instancetype.m
+++ b/test/SemaObjC/instancetype.m
@@ -25,7 +25,7 @@
 - (instancetype)otherMethodInProto2; // expected-note{{overridden method returns an instance of its class type}}
 @end
 
-@interface Subclass1 : Root
+@interface Subclass1 : Root // expected-note 4 {{receiver is object of the class that is declared here}}
 - (instancetype)initSubclass1;
 - (void)methodOnSubclass1;
 + (instancetype)allocSubclass1;
diff --git a/test/SemaObjC/message.m b/test/SemaObjC/message.m
index 40fa102..fc75cdb 100644
--- a/test/SemaObjC/message.m
+++ b/test/SemaObjC/message.m
@@ -107,7 +107,7 @@
                  // expected-warning {{instance method '-bar' not found}}
 }
 
-@interface I1
+@interface I1 // expected-note {{receiver is object of the class that is declared here}}
 -(void)unavail_meth  __attribute__((unavailable)); // expected-note {{marked unavailable here}}
 @end
 
diff --git a/test/SemaObjC/method-not-defined.m b/test/SemaObjC/method-not-defined.m
index 22466f7..8f43c5d 100644
--- a/test/SemaObjC/method-not-defined.m
+++ b/test/SemaObjC/method-not-defined.m
@@ -1,6 +1,6 @@
 // RUN: %clang_cc1 -fsyntax-only -verify %s
 
-@interface Foo
+@interface Foo // expected-note {{receiver is object of the class that is declared here}}
 @end
 
 void test() {
diff --git a/test/SemaObjC/missing-atend-metadata.m b/test/SemaObjC/missing-atend-metadata.m
index f072981..9d0024a 100644
--- a/test/SemaObjC/missing-atend-metadata.m
+++ b/test/SemaObjC/missing-atend-metadata.m
@@ -1,6 +1,6 @@
 // RUN: %clang_cc1 -triple i386-apple-darwin9 -fsyntax-only -verify -Wno-objc-root-class %s 
 
-@interface I0 
+@interface I0  // expected-note {{receiver is object of the class that is declared here}}
 @end
 
 @implementation I0 // expected-note {{implementation started here}}
diff --git a/test/SemaObjC/property-5.m b/test/SemaObjC/property-5.m
index cd7cc24..782f77c 100644
--- a/test/SemaObjC/property-5.m
+++ b/test/SemaObjC/property-5.m
@@ -8,7 +8,7 @@
 
 @interface MutableNSData : NSData @end
 
-@interface Base : NSData <P1>
+@interface Base : NSData <P1> // expected-note {{receiver is object of the class that is declared here}}
 @property(readonly) id ref;
 @property(readonly) Base *p_base;
 @property(readonly) NSData *nsdata;
diff --git a/test/SemaObjC/protocol-id-test-1.m b/test/SemaObjC/protocol-id-test-1.m
index 19a4432..013f291 100644
--- a/test/SemaObjC/protocol-id-test-1.m
+++ b/test/SemaObjC/protocol-id-test-1.m
@@ -7,7 +7,7 @@
 @protocol P
 @end
 
-@interface INTF<P>
+@interface INTF<P> // expected-note {{receiver is object of the class that is declared here}}
 - (void)IMeth;
 @end
 
diff --git a/test/SemaObjCXX/instancetype.mm b/test/SemaObjCXX/instancetype.mm
index bbf100e..87663b9 100644
--- a/test/SemaObjCXX/instancetype.mm
+++ b/test/SemaObjCXX/instancetype.mm
@@ -25,7 +25,7 @@
 - (instancetype)otherMethodInProto2; // expected-note{{overridden method returns an instance of its class type}}
 @end
 
-@interface Subclass1 : Root
+@interface Subclass1 : Root // expected-note 4 {{receiver is object of the class that is declared here}}
 - (instancetype)initSubclass1;
 - (void)methodOnSubclass1;
 + (instancetype)allocSubclass1;