diff --git a/clang-tools-extra/clangd/ClangdLSPServer.cpp b/clang-tools-extra/clangd/ClangdLSPServer.cpp
index a87da252b7a7e..4136155403fc1 100644
--- a/clang-tools-extra/clangd/ClangdLSPServer.cpp
+++ b/clang-tools-extra/clangd/ClangdLSPServer.cpp
@@ -623,6 +623,8 @@ void ClangdLSPServer::onInitialize(const InitializeParams &Params,
       {"clangdInlayHintsProvider", true},
       {"inlayHintProvider", true},
       {"foldingRangeProvider", true},
+      {"languages",
+       {"c", "cpp", "cuda-cpp", "objective-c", "objective-cpp", "hlsl"}},
   };
 
   {
diff --git a/clang-tools-extra/clangd/test/initialize-params.test b/clang-tools-extra/clangd/test/initialize-params.test
index a1fdae9870ab6..81f00e0f469c5 100644
--- a/clang-tools-extra/clangd/test/initialize-params.test
+++ b/clang-tools-extra/clangd/test/initialize-params.test
@@ -48,6 +48,14 @@
 # CHECK-NEXT:      "implementationProvider": true,
 # CHECK-NEXT:      "inactiveRegionsProvider": true,
 # CHECK-NEXT:      "inlayHintProvider": true,
+# CHECK-NEXT:      "languages": [
+# CHECK-NEXT:        "c",
+# CHECK-NEXT:        "cpp",
+# CHECK-NEXT:        "cuda-cpp",
+# CHECK-NEXT:        "objective-c",
+# CHECK-NEXT:        "objective-cpp",
+# CHECK-NEXT:        "hlsl"
+# CHECK-NEXT:      ],
 # CHECK-NEXT:      "memoryUsageProvider": true,
 # CHECK-NEXT:      "referencesProvider": true,
 # CHECK-NEXT:      "renameProvider": true,