diff --git a/library/core/src/array/mod.rs b/library/core/src/array/mod.rs
index ba61679564a69..28329bb090845 100644
--- a/library/core/src/array/mod.rs
+++ b/library/core/src/array/mod.rs
@@ -156,7 +156,6 @@ pub const fn from_mut<T>(s: &mut T) -> &mut [T; 1] {
 
 /// The error type returned when a conversion from a slice to an array fails.
 #[stable(feature = "try_from", since = "1.34.0")]
-#[rustc_allowed_through_unstable_modules]
 #[derive(Debug, Copy, Clone)]
 pub struct TryFromSliceError(());
 
diff --git a/src/doc/rustc-dev-guide/src/stability.md b/src/doc/rustc-dev-guide/src/stability.md
index 1bfe911c900c4..230925252bac3 100644
--- a/src/doc/rustc-dev-guide/src/stability.md
+++ b/src/doc/rustc-dev-guide/src/stability.md
@@ -34,7 +34,8 @@ Previously, due to a [rustc bug], stable items inside unstable modules were
 available to stable code in that location.
 As of <!-- date-check --> September 2024, items with [accidentally stabilized
 paths] are marked with the `#[rustc_allowed_through_unstable_modules]` attribute
-to prevent code dependent on those paths from breaking.
+to prevent code dependent on those paths from breaking. Do *not* add this attribute
+to any more items unless that is needed to avoid breaking changes.
 
 The `unstable` attribute may also have the `soft` value, which makes it a
 future-incompatible deny-by-default lint instead of a hard error. This is used