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 ## Change Log
 
+### Unreleased
+
+#### _Black_
+
+- Set `--pyi` mode if `--stdin-filename` ends in `.pyi` (#2169)
+
 ### 21.4b2
 
 #### _Black_
 
 - Fix crash if the user configuration directory is inaccessible. (#2158)
 
-- Clarify that _Black_ may change the AST, especially when cleaning up docstrings.
-  (#2159)
+- Clarify
+  [circumstances](https://github.com/psf/black/blob/master/docs/the_black_code_style.md#pragmatism)
+  in which _Black_ may change the AST (#2159)
 
 #### _Packaging_