Elaborate on what AST changes Black might perform

[etc/vim.git] / README.md

diff --git a/README.md b/README.md
index 8d6adb0567ef487611c6cb91ab4269d96c64932b..41cea761df564c4efb9ca60d323deb5d6073ac9b 100644 (file)
--- a/README.md
+++ b/README.md
@@ -237,9 +237,11 @@ is that **until the formatter becomes stable, you should expect some formatting
 change in the future**. That being said, no drastic stylistic changes are planned,
 mostly responses to bug reports.
 
-Also, as a temporary safety measure, _Black_ will check that the reformatted code still
-produces a valid AST that is equivalent to the original. This slows it down. If you're
-feeling confident, use `--fast`.
+Also, as a safety measure which slows down processing, _Black_ will check that the
+reformatted code still produces a valid AST that is effectively equivalent to the
+original (see the
+[Pragmatism](https://github.com/psf/black/blob/master/docs/the_black_code_style.md#pragmatism)
+section for details). If you're feeling confident, use `--fast`.
 
 ## The _Black_ code style