diff --git a/clang/include/clang/Index/IndexSymbol.h b/clang/include/clang/Index/IndexSymbol.h
index 068796141df8b..8aaaa695456c4 100644
--- a/clang/include/clang/Index/IndexSymbol.h
+++ b/clang/include/clang/Index/IndexSymbol.h
@@ -75,7 +75,7 @@ enum class SymbolSubKind : uint8_t {
   UsingValue,
 };
 
-typedef uint8_t SymbolPropertySet;
+typedef uint16_t SymbolPropertySet;
 /// Set of properties that provide additional info about a symbol.
 enum class SymbolProperty : SymbolPropertySet {
   Generic                       = 1 << 0,
@@ -86,8 +86,10 @@ enum class SymbolProperty : SymbolPropertySet {
   IBOutletCollection            = 1 << 5,
   GKInspectable                 = 1 << 6,
   Local                         = 1 << 7,
+  /// Symbol is part of a protocol interface.
+  ProtocolInterface             = 1 << 8,
 };
-static const unsigned SymbolPropertyBitNum = 8;
+static const unsigned SymbolPropertyBitNum = 9;
 
 /// Set of roles that are attributed to symbol occurrences.
 ///
diff --git a/clang/lib/Index/IndexSymbol.cpp b/clang/lib/Index/IndexSymbol.cpp
index 03b55ffe8a4ec..1cdc0984f780b 100644
--- a/clang/lib/Index/IndexSymbol.cpp
+++ b/clang/lib/Index/IndexSymbol.cpp
@@ -96,6 +96,9 @@ SymbolInfo index::getSymbolInfo(const Decl *D) {
   if (isFunctionLocalSymbol(D)) {
     Info.Properties |= (SymbolPropertySet)SymbolProperty::Local;
   }
+  if (isa<ObjCProtocolDecl>(D->getDeclContext())) {
+    Info.Properties |= (SymbolPropertySet)SymbolProperty::ProtocolInterface;
+  }
 
   if (const TagDecl *TD = dyn_cast<TagDecl>(D)) {
     switch (TD->getTagKind()) {
@@ -519,6 +522,7 @@ void index::applyForEachSymbolProperty(SymbolPropertySet Props,
   APPLY_FOR_PROPERTY(IBOutletCollection);
   APPLY_FOR_PROPERTY(GKInspectable);
   APPLY_FOR_PROPERTY(Local);
+  APPLY_FOR_PROPERTY(ProtocolInterface);
 
 #undef APPLY_FOR_PROPERTY
 }
@@ -539,6 +543,7 @@ void index::printSymbolProperties(SymbolPropertySet Props, raw_ostream &OS) {
     case SymbolProperty::IBOutletCollection: OS << "IBColl"; break;
     case SymbolProperty::GKInspectable: OS << "GKI"; break;
     case SymbolProperty::Local: OS << "local"; break;
+    case SymbolProperty::ProtocolInterface: OS << "protocol"; break;
     }
   });
 }
diff --git a/clang/test/Index/Core/external-source-symbol-attr.m b/clang/test/Index/Core/external-source-symbol-attr.m
index cdc52966977d1..41bb7a264ab3e 100644
--- a/clang/test/Index/Core/external-source-symbol-attr.m
+++ b/clang/test/Index/Core/external-source-symbol-attr.m
@@ -87,7 +87,7 @@ void test2(I3 *i3, id<ExtProt2> prot2, SomeEnum some) {
   [i3 meth2];
   // CHECK: [[@LINE-1]]:7 | instance-method/Swift | meth2 | c:@CM@modname@objc(cs)I3(im)meth2 |
   [prot2 meth];
-  // CHECK: [[@LINE-1]]:10 | instance-method/Swift | meth | c:@M@modname@objc(pl)ExtProt2(im)meth |
+  // CHECK: [[@LINE-1]]:10 | instance-method(protocol)/Swift | meth | c:@M@modname@objc(pl)ExtProt2(im)meth |
   some = SomeEnumFirst;
   // CHECK: [[@LINE-1]]:10 | enumerator/Swift | SomeEnumFirst | c:@M@modname@E@SomeEnum@SomeEnumFirst |
 }
diff --git a/clang/test/Index/Core/index-source.m b/clang/test/Index/Core/index-source.m
index c319be63ab9ee..ed616dbc9ae6e 100644
--- a/clang/test/Index/Core/index-source.m
+++ b/clang/test/Index/Core/index-source.m
@@ -474,12 +474,12 @@ - (void)test: (int)x :(int)y { // CHECK: [[@LINE]]:9 | instance-method/ObjC | te
 @end
 
 @protocol Prot3 // CHECK: [[@LINE]]:11 | protocol/ObjC | Prot3 | [[PROT3_USR:.*]] | <no-cgname> | Decl |
--(void)meth;
+-(void)meth; // CHECK: [[@LINE]]:8 | instance-method(protocol)/ObjC | meth | [[PROT3_meth_USR:.*]] | -[Prot3 meth] | Decl,Dyn,RelChild |
 @end
 
 void test_rec1() {
   id<Prot3, Prot1> o1;
-  [o1 meth]; // CHECK: [[@LINE]]:7 | instance-method/ObjC | meth | {{.*}} | Ref,Call,Dyn,RelRec,RelCall,RelCont | rel: 3
+  [o1 meth]; // CHECK: [[@LINE]]:7 | instance-method(protocol)/ObjC | meth | [[PROT3_meth_USR]] | {{.*}} | Ref,Call,Dyn,RelRec,RelCall,RelCont | rel: 3
     // CHECK-NEXT: RelCall,RelCont | test_rec1 |
     // CHECK-NEXT: RelRec | Prot3 | [[PROT3_USR]]
     // CHECK-NEXT: RelRec | Prot1 | [[PROT1_USR]]