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-rw-r--r--src/doc/rustdoc/src/unstable-features.md4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/doc/rustdoc/src/unstable-features.md b/src/doc/rustdoc/src/unstable-features.md
index 7bd2970eee7..724e260009e 100644
--- a/src/doc/rustdoc/src/unstable-features.md
+++ b/src/doc/rustdoc/src/unstable-features.md
@@ -796,3 +796,7 @@ will be split as follows:
     "you today?",
 ]
 ```
+
+## `--generate-macro-expansion`: Generate macros expansion toggles in source code
+
+This flag enables the generation of toggles to expand macros in the HTML source code pages,