diff --git a/clippy_lints/src/returns.rs b/clippy_lints/src/returns.rs
index 631ecf1428d..b5686e390ad 100644
--- a/clippy_lints/src/returns.rs
+++ b/clippy_lints/src/returns.rs
@@ -25,6 +25,12 @@ declare_clippy_lint! {
     /// It is just extraneous code. Remove it to make your code
     /// more rusty.
     ///
+    /// ### Known problems
+    /// In the case of some temporaries, e.g. locks, eliding the variable binding could lead
+    /// to deadlocks. See [this issue](https://github.com/rust-lang/rust/issues/37612).
+    /// This could become relevant if the code is later changed to use the code that would have been
+    /// bound without first assigning it to a let-binding.
+    ///
     /// ### Example
     /// ```rust
     /// fn foo() -> String {