diff --git a/include/swift/IDE/SyntaxModel.h b/include/swift/IDE/SyntaxModel.h
index 60b8c69e55e..1d4c1c662c9 100644
--- a/include/swift/IDE/SyntaxModel.h
+++ b/include/swift/IDE/SyntaxModel.h
@@ -32,6 +32,8 @@ enum class SyntaxNodeKind : uint8_t {
   Integer,
   Floating,
   String,
+  /// Marks the parens for a string interpolation.
+  StringInterpolationAnchor,
   Character,
   CommentLine,
   CommentBlock,
diff --git a/lib/IDE/SyntaxModel.cpp b/lib/IDE/SyntaxModel.cpp
index 5d64093e9a7..4f72df45c19 100644
--- a/lib/IDE/SyntaxModel.cpp
+++ b/lib/IDE/SyntaxModel.cpp
@@ -56,7 +56,8 @@ SyntaxModelContext::SyntaxModelContext(SourceFile &SrcFile)
                                            /*TokenizeInterpolatedString=*/true);
   std::vector<SyntaxNode> Nodes;
   SourceLoc AttrLoc;
-  for (auto &Tok : Tokens) {
+  for (unsigned I = 0, E = Tokens.size(); I != E; ++I) {
+    auto &Tok = Tokens[I];
     SyntaxNodeKind Kind;
     SourceLoc Loc;
     Optional<unsigned> Length;
@@ -100,6 +101,35 @@ SyntaxModelContext::SyntaxModelContext(SourceFile &SrcFile)
         // attribute name.
         AttrLoc = Tok.getLoc();
         continue;
+
+      case tok::l_paren: {
+        // Check if this is a string interpolation paren.
+        if (I == 0)
+          continue;
+        auto &PrevTok = Tokens[I-1];
+        if (PrevTok.getKind() != tok::string_literal)
+          continue;
+        StringRef StrText = PrevTok.getText();
+        if (StrText.size() > 1 && StrText.back() == '\"')
+          continue;
+        Kind = SyntaxNodeKind::StringInterpolationAnchor;
+        break;
+      }
+
+      case tok::r_paren: {
+        // Check if this is a string interpolation paren.
+        if (I+1 == E)
+          continue;
+        auto &NextTok = Tokens[I+1];
+        if (NextTok.getKind() != tok::string_literal)
+          continue;
+        StringRef StrText = NextTok.getText();
+        if (StrText.size() > 1 && StrText.front() == '\"')
+          continue;
+        Kind = SyntaxNodeKind::StringInterpolationAnchor;
+        break;
+      }
+
       default:
         continue;
       }
diff --git a/test/IDE/coloring.swift b/test/IDE/coloring.swift
index 7a173b8bf16..20fdb64e34d 100644
--- a/test/IDE/coloring.swift
+++ b/test/IDE/coloring.swift
@@ -173,7 +173,7 @@ func genFn<T : Prot where T.Blarg : Prot2>(_: T) -> Int {}
 func f(x: Int) -> Int {
   // CHECK: <comment-line>// string interpolation is the best</comment-line>
   // string interpolation is the best
-  // CHECK: <str>"This is string </str>\(genFn({(a:<type>Int</type> -> <type>Int</type>) <kw>in</kw> a}))<str> interpolation"</str>
+  // CHECK: <str>"This is string </str>\<anchor>(</anchor>genFn({(a:<type>Int</type> -> <type>Int</type>) <kw>in</kw> a})<anchor>)</anchor><str> interpolation"</str>
   "This is string \(genFn({(a:Int -> Int) in a})) interpolation"
 }
 
@@ -194,7 +194,7 @@ func test() {
 typealias MyInt = Int
 
 func test2(x: Int) {
-  // CHECK: <str>"</str>\(x)<str>"</str>
+  // CHECK: <str>"</str>\<anchor>(</anchor>x<anchor>)</anchor><str>"</str>
   "\(x)"
 }
 
diff --git a/tools/swift-ide-test/swift-ide-test.cpp b/tools/swift-ide-test/swift-ide-test.cpp
index 5bf433f0eec..d6bd550bb2f 100644
--- a/tools/swift-ide-test/swift-ide-test.cpp
+++ b/tools/swift-ide-test/swift-ide-test.cpp
@@ -610,6 +610,7 @@ public:
     case SyntaxNodeKind::Integer: Id = "int"; break;
     case SyntaxNodeKind::Floating: Id = "float"; break;
     case SyntaxNodeKind::String: Id = "str"; break;
+    case SyntaxNodeKind::StringInterpolationAnchor: Id = "anchor"; break;
     case SyntaxNodeKind::Character: Id = "char"; break;
     case SyntaxNodeKind::CommentLine: Id = "comment-line"; break;
     case SyntaxNodeKind::CommentBlock: Id = "comment-block"; break;
@@ -635,6 +636,7 @@ public:
     case SyntaxNodeKind::Integer: Col = llvm::raw_ostream::BLUE; break;
     case SyntaxNodeKind::Floating: Col = llvm::raw_ostream::BLUE; break;
     case SyntaxNodeKind::String: Col = llvm::raw_ostream::RED; break;
+    case SyntaxNodeKind::StringInterpolationAnchor: Col = llvm::raw_ostream::CYAN; break;
     case SyntaxNodeKind::Character: Col = llvm::raw_ostream::BLUE; break;
     case SyntaxNodeKind::CommentLine: Col = llvm::raw_ostream::GREEN; break;
     case SyntaxNodeKind::CommentBlock: Col = llvm::raw_ostream::GREEN; break;