diff --git a/gitmirror/crates/gitmirror-xrpc/src/format_patch.rs b/gitmirror/crates/gitmirror-xrpc/src/format_patch.rs
index ac4a4cc36..67f8fe533 100644
--- a/gitmirror/crates/gitmirror-xrpc/src/format_patch.rs
+++ b/gitmirror/crates/gitmirror-xrpc/src/format_patch.rs
@@ -2453,6 +2453,8 @@ mod tests {
     }
 
     /// `GITMIRROR_FUZZ_REPO=<clone> cargo test --release -p gitmirror-xrpc real_history -- --ignored --nocapture`
+    /// known drift: hunks imara-diff slides or splits, renames git pairs by bytes and best score first,
+    /// messages git re-encodes from `encoding`
     #[test]
     #[ignore]
     #[allow(clippy::print_stderr)]