implement `directives` (#3203)

fixes #3166

1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index 663ce7b4..b21736de 100644
--- a/README.md
+++ b/README.md
@@ -620,6 +620,8 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 
 - `dead_code` (default: `true`) -- remove unreachable code
 
+- `directives` (default: `true`) -- remove redundant or non-standard directives
+
 - `drop_console` (default: `false`) -- Pass `true` to discard calls to
   `console.*` functions. If you wish to drop a specific function call
   such as `console.info` and/or retain side effects from function arguments