Tweak comment above DiagGroup<"all">.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150600 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/Basic/DiagnosticGroups.td b/include/clang/Basic/DiagnosticGroups.td
index 5e33a8a..4924e85 100644
--- a/include/clang/Basic/DiagnosticGroups.td
+++ b/include/clang/Basic/DiagnosticGroups.td
@@ -334,7 +334,9 @@
// Thread Safety warnings
def ThreadSafety : DiagGroup<"thread-safety">;
-// -Wall is -Wmost -Wparentheses -Wdangling-else -Wswitch
+// Note that putting warnings in -Wall will not disable them by default. If a
+// warning should be active _only_ when -Wall is passed in, mark it as
+// DefaultIgnore in addition to putting it here.
def : DiagGroup<"all", [Most, Parentheses, Switch]>;
// Aliases.
