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diff --git a/book/src/configuration.md b/book/src/configuration.md
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@@ -340,7 +340,12 @@ Currently unused
#### `[editor.gutters.diff]` Section
-Currently unused
+The `diff` gutter option displays colored bars indicating whether a `git` diff represents that a line was added, removed or changed.
+These colors are controlled by the theme attributes `diff.plus`, `diff.minus` and `diff.delta`.
+
+Other diff providers will eventually be supported by a future plugin system.
+
+There are currently no options for this section.
#### `[editor.gutters.spacer]` Section