properly run ourselves twice (#2807)

[etc/vim.git] / docs / the_black_code_style / future_style.md

diff --git a/docs/the_black_code_style/future_style.md b/docs/the_black_code_style/future_style.md
index aca9fe040171d15ad314834d7cf4321af321e363..2ec2c0333a5fb3a1db077c20f74578956ef20739 100644 (file)
--- a/docs/the_black_code_style/future_style.md
+++ b/docs/the_black_code_style/future_style.md
@@ -33,3 +33,19 @@ with \
 
 Although when the target version is Python 3.9 or higher, _Black_ will use parentheses
 instead since they're allowed in Python 3.9 and higher.
+
+## Preview style
+
+Experimental, potentially disruptive style changes are gathered under the `--preview`
+CLI flag. At the end of each year, these changes may be adopted into the default style,
+as described in [The Black Code Style](./index.rst). Because the functionality is
+experimental, feedback and issue reports are highly encouraged!
+
+### Improved string processing
+
+_Black_ will split long string literals and merge short ones. Parentheses are used where
+appropriate. When split, parts of f-strings that don't need formatting are converted to
+plain strings. User-made splits are respected when they do not exceed the line length
+limit. Line continuation backslashes are converted into parenthesized strings.
+Unnecessary parentheses are stripped. The stability and status of this feature is
+tracked in [this issue](https://github.com/psf/black/issues/2188).