diff --git a/crates/ruff_linter/src/rules/refurb/rules/readlines_in_for.rs b/crates/ruff_linter/src/rules/refurb/rules/readlines_in_for.rs
index e06626da9c438..68757a60f1971 100644
--- a/crates/ruff_linter/src/rules/refurb/rules/readlines_in_for.rs
+++ b/crates/ruff_linter/src/rules/refurb/rules/readlines_in_for.rs
@@ -29,6 +29,13 @@ use crate::checkers::ast::Checker;
 ///         ...
 /// ```
 ///
+/// ## Fix safety
+///
+/// This fix is marked as unsafe if the file is iterated multiple times,
+/// replacing `readlines()` with direct iteration may consume the file
+/// contents in earlier iterations, resulting in empty results for
+/// subsequent iterations.
+///
 /// ## References
 /// - [Python documentation: `io.IOBase.readlines`](https://docs.python.org/3/library/io.html#io.IOBase.readlines)
 #[derive(ViolationMetadata)]