diff --git a/clang-tools-extra/clangd/CodeComplete.cpp b/clang-tools-extra/clangd/CodeComplete.cpp
index fb39b7b29224..a8182ce98ebe 100644
--- a/clang-tools-extra/clangd/CodeComplete.cpp
+++ b/clang-tools-extra/clangd/CodeComplete.cpp
@@ -1867,14 +1867,41 @@ private:
     CodeCompleteResult Output;
 
     // Convert the results to final form, assembling the expensive strings.
+    // If necessary, search the index for documentation comments.
+    LookupRequest Req;
+    llvm::DenseMap<SymbolID, uint32_t> SymbolToCompletion;
     for (auto &C : Scored) {
       Output.Completions.push_back(toCodeCompletion(C.first));
       Output.Completions.back().Score = C.second;
       Output.Completions.back().CompletionTokenRange = ReplacedRange;
+      if (Opts.Index && !Output.Completions.back().Documentation) {
+        for (auto &Cand : C.first) {
+          if (Cand.SemaResult &&
+              Cand.SemaResult->Kind == CodeCompletionResult::RK_Declaration) {
+            auto ID = clangd::getSymbolID(Cand.SemaResult->getDeclaration());
+            if (!ID)
+              continue;
+            Req.IDs.insert(ID);
+            SymbolToCompletion[ID] = Output.Completions.size() - 1;
+          }
+        }
+      }
     }
     Output.HasMore = Incomplete;
     Output.Context = CCContextKind;
     Output.CompletionRange = ReplacedRange;
+
+    // Look up documentation from the index.
+    if (Opts.Index) {
+      Opts.Index->lookup(Req, [&](const Symbol &S) {
+        if (S.Documentation.empty())
+          return;
+        auto &C = Output.Completions[SymbolToCompletion.at(S.ID)];
+        C.Documentation.emplace();
+        parseDocumentation(S.Documentation, *C.Documentation);
+      });
+    }
+
     return Output;
   }
 
diff --git a/clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp b/clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
index 9d48a6e09fc7..b12f8275b8a2 100644
--- a/clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
+++ b/clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
@@ -1136,6 +1136,87 @@ int x = foo^
       Contains(AllOf(named("foo"), doc("This comment should be retained!"))));
 }
 
+TEST(CompletionTest, CommentsOnMembersFromHeader) {
+  MockFS FS;
+  MockCompilationDatabase CDB;
+
+  auto Opts = ClangdServer::optsForTest();
+  Opts.BuildDynamicSymbolIndex = true;
+
+  ClangdServer Server(CDB, FS, Opts);
+
+  FS.Files[testPath("foo.h")] = R"cpp(
+    struct alpha {
+      /// This is a member field.
+      int gamma;
+
+      /// This is a member function.
+      int delta();
+    };
+  )cpp";
+
+  auto File = testPath("foo.cpp");
+  Annotations Test(R"cpp(
+#include "foo.h"
+alpha a;
+int x = a.^
+     )cpp");
+  runAddDocument(Server, File, Test.code());
+  auto CompletionList =
+      llvm::cantFail(runCodeComplete(Server, File, Test.point(), {}));
+
+  EXPECT_THAT(CompletionList.Completions,
+              Contains(AllOf(named("gamma"), doc("This is a member field."))));
+  EXPECT_THAT(
+      CompletionList.Completions,
+      Contains(AllOf(named("delta"), doc("This is a member function."))));
+}
+
+TEST(CompletionTest, CommentsOnMembersFromHeaderOverloadBundling) {
+  using testing::AnyOf;
+  MockFS FS;
+  MockCompilationDatabase CDB;
+
+  auto Opts = ClangdServer::optsForTest();
+  Opts.BuildDynamicSymbolIndex = true;
+
+  ClangdServer Server(CDB, FS, Opts);
+
+  FS.Files[testPath("foo.h")] = R"cpp(
+    struct alpha {
+      /// bool overload.
+      int delta(bool b);
+
+      /// int overload.
+      int delta(int i);
+
+      void epsilon(long l);
+      
+      /// This one has a comment.
+      void epsilon(int i);
+    };
+  )cpp";
+
+  auto File = testPath("foo.cpp");
+  Annotations Test(R"cpp(
+#include "foo.h"
+alpha a;
+int x = a.^
+     )cpp");
+  runAddDocument(Server, File, Test.code());
+  clangd::CodeCompleteOptions CCOpts;
+  CCOpts.BundleOverloads = true;
+  auto CompletionList =
+      llvm::cantFail(runCodeComplete(Server, File, Test.point(), CCOpts));
+
+  EXPECT_THAT(
+      CompletionList.Completions,
+      Contains(AllOf(named("epsilon"), doc("This one has a comment."))));
+  EXPECT_THAT(CompletionList.Completions,
+              Contains(AllOf(named("delta"), AnyOf(doc("bool overload."),
+                                                   doc("int overload.")))));
+}
+
 TEST(CompletionTest, GlobalCompletionFiltering) {
 
   Symbol Class = cls("XYZ");