diff --git a/clippy_lints/src/methods/utils.rs b/clippy_lints/src/methods/utils.rs
index 3611b341897a..b0cc7a785bc3 100644
--- a/clippy_lints/src/methods/utils.rs
+++ b/clippy_lints/src/methods/utils.rs
@@ -8,6 +8,9 @@ use rustc_middle::ty::{self, Ty};
 use rustc_span::Span;
 use rustc_span::symbol::sym;
 
+/// Checks if `expr`, of type `ty`, corresponds to a slice or can be dereferenced to a slice, or if
+/// `expr` is a method call to `.iter()` on such a type. In these cases, return the slice-like
+/// expression.
 pub(super) fn derefs_to_slice<'tcx>(
     cx: &LateContext<'tcx>,
     expr: &'tcx Expr<'tcx>,