diff --git a/clang-tools-extra/clangd/tool/ClangdMain.cpp b/clang-tools-extra/clangd/tool/ClangdMain.cpp
--- a/clang-tools-extra/clangd/tool/ClangdMain.cpp
+++ b/clang-tools-extra/clangd/tool/ClangdMain.cpp
@@ -475,7 +475,7 @@
 	https://clang.llvm.org/extra/clangd/
 	https://microsoft.github.io/language-server-protocol/
 
-clangd accepts flags on the commandline, and in the CLANGD_FLAGS environment variable.
+clangd accepts flags on the commandline, and in the CLANGD_FLAGS/CLANGD_TRACE environment variable.
 )";
   llvm::cl::HideUnrelatedOptions(ClangdCategories);
   llvm::cl::ParseCommandLineOptions(argc, argv, Overview,