diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index 6b2c4714dc0b0d..fa194d4bffd963 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -1,4 +1,5 @@
-# See www/CMake.html for instructions on how to build libcxx with CMake.
+# See https://libcxx.llvm.org/docs/BuildingLibcxx.html for instructions on how
+# to build libcxx with CMake.
 
 #===============================================================================
 # Setup Project