diff --git a/crates/ruff_linter/src/rules/ruff/rules/collection_literal_concatenation.rs b/crates/ruff_linter/src/rules/ruff/rules/collection_literal_concatenation.rs
index 6c9239ee47..60dcd09b34 100644
--- a/crates/ruff_linter/src/rules/ruff/rules/collection_literal_concatenation.rs
+++ b/crates/ruff_linter/src/rules/ruff/rules/collection_literal_concatenation.rs
@@ -33,6 +33,12 @@ use crate::fix::snippet::SourceCodeSnippet;
 /// bar = [1, *foo, 5, 6]
 /// ```
 ///
+/// ## Fix safety
+///
+/// The fix is always marked as unsafe because the `+` operator uses the `__add__` magic method and
+/// `*`-unpacking uses the `__iter__` magic method. Both of these could have custom
+/// implementations, causing the fix to change program behaviour.
+///
 /// ## References
 /// - [PEP 448 – Additional Unpacking Generalizations](https://peps.python.org/pep-0448/)
 /// - [Python documentation: Sequence Types — `list`, `tuple`, `range`](https://docs.python.org/3/library/stdtypes.html#sequence-types-list-tuple-range)