Index: clang-tools-extra/clang-doc/Representation.h
===================================================================
--- clang-tools-extra/clang-doc/Representation.h
+++ clang-tools-extra/clang-doc/Representation.h
@@ -46,6 +46,41 @@
   CommentInfo() = default;
   CommentInfo(CommentInfo &Other) = delete;
   CommentInfo(CommentInfo &&Other) = default;
+  CommentInfo &operator=(CommentInfo &&Other) = default;
+
+  bool operator==(const CommentInfo &Other) const {
+    auto FirstCI = std::tie(Kind, Text, Name, Direction, ParamName, CloseName,
+                            SelfClosing, Explicit, AttrKeys, AttrValues, Args);
+    auto SecondCI =
+        std::tie(Other.Kind, Other.Text, Other.Name, Other.Direction,
+                 Other.ParamName, Other.CloseName, Other.SelfClosing,
+                 Other.Explicit, Other.AttrKeys, Other.AttrValues, Other.Args);
+
+    if (FirstCI != SecondCI || Children.size() != Other.Children.size())
+      return false;
+
+    return std::equal(Children.begin(), Children.end(), Other.Children.begin(),
+                      llvm::deref<llvm::equal>{});
+  }
+
+  bool operator<(const CommentInfo &Other) const {
+    auto FirstCI = std::tie(Kind, Text, Name, Direction, ParamName, CloseName,
+                            SelfClosing, Explicit, AttrKeys, AttrValues, Args);
+    auto SecondCI =
+        std::tie(Other.Kind, Other.Text, Other.Name, Other.Direction,
+                 Other.ParamName, Other.CloseName, Other.SelfClosing,
+                 Other.Explicit, Other.AttrKeys, Other.AttrValues, Other.Args);
+
+    if (FirstCI < SecondCI ||
+        (FirstCI == SecondCI && Children.size() < Other.Children.size()))
+      return true;
+
+    if (FirstCI > SecondCI || Children.size() > Other.Children.size())
+      return false;
+
+    return std::equal(Children.begin(), Children.end(), Other.Children.begin(),
+                      llvm::deref<llvm::less>{});
+  }
 
   SmallString<16>
       Kind; // Kind of comment (FullComment, ParagraphComment, TextComment,
@@ -148,6 +183,11 @@
            std::tie(Other.LineNumber, Other.Filename);
   }
 
+  bool operator<(const Location &Other) const {
+    return std::tie(LineNumber, Filename) <
+           std::tie(Other.LineNumber, Other.Filename);
+  }
+
   int LineNumber;           // Line number of this Location.
   SmallString<32> Filename; // File for this Location.
 };
Index: clang-tools-extra/clang-doc/Representation.cpp
===================================================================
--- clang-tools-extra/clang-doc/Representation.cpp
+++ clang-tools-extra/clang-doc/Representation.cpp
@@ -122,6 +122,9 @@
   // Unconditionally extend the description, since each decl may have a comment.
   std::move(Other.Description.begin(), Other.Description.end(),
             std::back_inserter(Description));
+  std::sort(Description.begin(), Description.end());
+  auto Last = std::unique(Description.begin(), Description.end());
+  Description.erase(Last, Description.end());
 }
 
 bool Info::mergeable(const Info &Other) {
@@ -134,6 +137,9 @@
     DefLoc = std::move(Other.DefLoc);
   // Unconditionally extend the list of locations, since we want all of them.
   std::move(Other.Loc.begin(), Other.Loc.end(), std::back_inserter(Loc));
+  std::sort(Loc.begin(), Loc.end());
+  auto Last = std::unique(Loc.begin(), Loc.end());
+  Loc.erase(Last, Loc.end());
   mergeBase(std::move(Other));
 }
 
Index: clang-tools-extra/unittests/clang-doc/MergeTest.cpp
===================================================================
--- clang-tools-extra/unittests/clang-doc/MergeTest.cpp
+++ clang-tools-extra/unittests/clang-doc/MergeTest.cpp
@@ -159,15 +159,37 @@
   One.IsMethod = true;
   One.Parent = Reference(EmptySID, "Parent", InfoType::IT_namespace);
 
+  One.Description.emplace_back();
+  auto OneFullComment = &One.Description.back();
+  OneFullComment->Kind = "FullComment";
+  auto OneParagraphComment = llvm::make_unique<CommentInfo>();
+  OneParagraphComment->Kind = "ParagraphComment";
+  auto OneTextComment = llvm::make_unique<CommentInfo>();
+  OneTextComment->Kind = "TextComment";
+  OneTextComment->Text = "This is a text comment.";
+  OneParagraphComment->Children.push_back(std::move(OneTextComment));
+  OneFullComment->Children.push_back(std::move(OneParagraphComment));
+
   FunctionInfo Two;
   Two.Name = "f";
   Two.Namespace.emplace_back(EmptySID, "A", InfoType::IT_namespace);
 
-  Two.Loc.emplace_back(20, llvm::SmallString<16>{"test.cpp"});
+  Two.Loc.emplace_back(12, llvm::SmallString<16>{"test.cpp"});
 
   Two.ReturnType = TypeInfo(EmptySID, "void", InfoType::IT_default);
   Two.Params.emplace_back("int", "P");
 
+  Two.Description.emplace_back();
+  auto TwoFullComment = &Two.Description.back();
+  TwoFullComment->Kind = "FullComment";
+  auto TwoParagraphComment = llvm::make_unique<CommentInfo>();
+  TwoParagraphComment->Kind = "ParagraphComment";
+  auto TwoTextComment = llvm::make_unique<CommentInfo>();
+  TwoTextComment->Kind = "TextComment";
+  TwoTextComment->Text = "This is a text comment.";
+  TwoParagraphComment->Children.push_back(std::move(TwoTextComment));
+  TwoFullComment->Children.push_back(std::move(TwoParagraphComment));
+
   std::vector<std::unique_ptr<Info>> Infos;
   Infos.emplace_back(llvm::make_unique<FunctionInfo>(std::move(One)));
   Infos.emplace_back(llvm::make_unique<FunctionInfo>(std::move(Two)));
@@ -178,13 +200,23 @@
 
   Expected->DefLoc = Location(10, llvm::SmallString<16>{"test.cpp"});
   Expected->Loc.emplace_back(12, llvm::SmallString<16>{"test.cpp"});
-  Expected->Loc.emplace_back(20, llvm::SmallString<16>{"test.cpp"});
 
   Expected->ReturnType = TypeInfo(EmptySID, "void", InfoType::IT_default);
   Expected->Params.emplace_back("int", "P");
   Expected->IsMethod = true;
   Expected->Parent = Reference(EmptySID, "Parent", InfoType::IT_namespace);
 
+  Expected->Description.emplace_back();
+  auto ExpectedFullComment = &Expected->Description.back();
+  ExpectedFullComment->Kind = "FullComment";
+  auto ExpectedParagraphComment = llvm::make_unique<CommentInfo>();
+  ExpectedParagraphComment->Kind = "ParagraphComment";
+  auto ExpectedTextComment = llvm::make_unique<CommentInfo>();
+  ExpectedTextComment->Kind = "TextComment";
+  ExpectedTextComment->Text = "This is a text comment.";
+  ExpectedParagraphComment->Children.push_back(std::move(ExpectedTextComment));
+  ExpectedFullComment->Children.push_back(std::move(ExpectedParagraphComment));
+
   auto Actual = mergeInfos(Infos);
   assert(Actual);
   CheckFunctionInfo(InfoAsFunction(Expected.get()),