diff --git a/clang/lib/Headers/__stddef_null.h b/clang/lib/Headers/__stddef_null.h
--- a/clang/lib/Headers/__stddef_null.h
+++ b/clang/lib/Headers/__stddef_null.h
@@ -15,9 +15,5 @@
 #define NULL 0
 #endif
 #else
-// Don't add any whitespaces in ((void*)0) below!
-// musl (https://www.musl-libc.org/) redefines `NULL` as such and redefinition
-// with a different expression, even in terms of a single whitespace, causes a
-// warning.
 #define NULL ((void*)0)
 #endif