diff --git a/clang-tools-extra/clangd/ClangdLSPServer.cpp b/clang-tools-extra/clangd/ClangdLSPServer.cpp
--- a/clang-tools-extra/clangd/ClangdLSPServer.cpp
+++ b/clang-tools-extra/clangd/ClangdLSPServer.cpp
@@ -620,7 +620,7 @@
             {"documentSymbolProvider", true},
             {"workspaceSymbolProvider", true},
             {"referencesProvider", true},
-            {"astProvider", true},
+            {"astProvider", true}, // clangd extension
             {"executeCommandProvider",
              llvm::json::Object{
                  {"commands",
@@ -628,7 +628,9 @@
                    ExecuteCommandParams::CLANGD_APPLY_TWEAK}},
              }},
             {"typeHierarchyProvider", true},
-            {"memoryUsageProvider", true}, // clangd extension.
+            {"memoryUsageProvider", true}, // clangd extension
+            {"compilationDatabase",        // clangd extension
+             llvm::json::Object{{"automaticReload", true}}},
             {"callHierarchyProvider", true},
         }}}};
   if (Opts.Encoding)
diff --git a/clang-tools-extra/clangd/test/initialize-params.test b/clang-tools-extra/clangd/test/initialize-params.test
--- a/clang-tools-extra/clangd/test/initialize-params.test
+++ b/clang-tools-extra/clangd/test/initialize-params.test
@@ -8,6 +8,9 @@
 # CHECK-NEXT:      "astProvider": true,
 # CHECK-NEXT:      "callHierarchyProvider": true,
 # CHECK-NEXT:      "codeActionProvider": true,
+# CHECK-NEXT:      "compilationDatabase": {
+# CHECK-NEXT:        "automaticReload": true
+# CHECK-NEXT:      },
 # CHECK-NEXT:      "completionProvider": {
 # CHECK-NEXT:        "allCommitCharacters": [
 # CHECK-NEXT:          " ",