diff --git a/src/librustc_lint/builtin.rs b/src/librustc_lint/builtin.rs
index 877dc43fb7b9be10dcd8073d0bb6dbc8bc43d617..3279f2436220c9fa0a273fe9b0e504c640a5938c 100644
--- a/src/librustc_lint/builtin.rs
+++ b/src/librustc_lint/builtin.rs
@@ -1949,7 +1949,7 @@ fn ty_find_init_error<'tcx>(
                 Adt(..) if ty.is_box() => Some((format!("`Box` must be non-null"), None)),
                 FnPtr(..) => Some((format!("Function pointers must be non-null"), None)),
                 Never => Some((format!("The never type (`!`) has no valid value"), None)),
-                // Primitive types with other constraints
+                // Primitive types with other constraints.
                 Bool if init == InitKind::Uninit =>
                     Some((format!("Booleans must be `true` or `false`"), None)),
                 Char if init == InitKind::Uninit =>