diff --git a/compiler/rustc_middle/src/ty/fast_reject.rs b/compiler/rustc_middle/src/ty/fast_reject.rs
index deb4dcf1f76..668aa4521c1 100644
--- a/compiler/rustc_middle/src/ty/fast_reject.rs
+++ b/compiler/rustc_middle/src/ty/fast_reject.rs
@@ -62,6 +62,9 @@ pub enum TreatParams {
     /// correct mode for *lookup*, as during candidate selection.
     ///
     /// N.B. during deep rejection, this acts identically to `ForLookup`.
+    ///
+    /// FIXME(-Ztrait-solver=next): Remove this variant and cleanup
+    /// the code.
     NextSolverLookup,
 }