diff --git a/library/core/src/num/nonzero.rs b/library/core/src/num/nonzero.rs
index 7876fced1c98..f52438e4e62e 100644
--- a/library/core/src/num/nonzero.rs
+++ b/library/core/src/num/nonzero.rs
@@ -31,7 +31,7 @@ use crate::{fmt, intrinsics, ptr, ub_checks};
     issue = "none"
 )]
 pub unsafe trait ZeroablePrimitive: Sized + Copy + private::Sealed {
-    #[doc(hidden)]
+    /// A type like `Self` but with a niche that includes zero.
     type NonZeroInner: Sized + Copy;
 }
 
diff --git a/tests/rustdoc-html/auto/auto-trait-bounds-by-associated-type-50159.rs b/tests/rustdoc-html/auto/auto-trait-bounds-by-associated-type-50159.rs
index 2803c4da437f..14981783e5f3 100644
--- a/tests/rustdoc-html/auto/auto-trait-bounds-by-associated-type-50159.rs
+++ b/tests/rustdoc-html/auto/auto-trait-bounds-by-associated-type-50159.rs
@@ -20,7 +20,8 @@ where
 //@ has - '//h3[@class="code-header"]' 'impl<B> Send for Switch<B>where <B as Signal>::Item: Send'
 //@ has - '//h3[@class="code-header"]' 'impl<B> Sync for Switch<B>where <B as Signal>::Item: Sync'
 //@ count - '//*[@id="implementations-list"]//*[@class="impl"]' 0
-//@ count - '//*[@id="synthetic-implementations-list"]//*[@class="impl"]' 6
+//@ count - '//*[@id="synthetic-implementations-list"]//*[@class="impl"]' 7
+// The number here will need updating when new auto traits are added:     ^
 pub struct Switch<B: Signal> {
     pub inner: <B as Signal2>::Item2,
 }
diff --git a/tests/rustdoc-html/empty-section.rs b/tests/rustdoc-html/empty-section.rs
index 71ebc66d6953..1e6e725a5a7b 100644
--- a/tests/rustdoc-html/empty-section.rs
+++ b/tests/rustdoc-html/empty-section.rs
@@ -1,13 +1,15 @@
 #![crate_name = "foo"]
-#![feature(negative_impls, freeze_impls, freeze)]
+#![feature(negative_impls, freeze_impls, freeze, unsafe_unpin)]
 
 pub struct Foo;
 
 //@ has foo/struct.Foo.html
 //@ !hasraw - 'Auto Trait Implementations'
+// Manually un-implement all auto traits for Foo:
 impl !Send for Foo {}
 impl !Sync for Foo {}
 impl !std::marker::Freeze for Foo {}
+impl !std::marker::UnsafeUnpin for Foo {}
 impl !std::marker::Unpin for Foo {}
 impl !std::panic::RefUnwindSafe for Foo {}
 impl !std::panic::UnwindSafe for Foo {}
diff --git a/tests/rustdoc-html/synthetic_auto/basic.rs b/tests/rustdoc-html/synthetic_auto/basic.rs
index 9daf8963997a..e8c2f5da9fe6 100644
--- a/tests/rustdoc-html/synthetic_auto/basic.rs
+++ b/tests/rustdoc-html/synthetic_auto/basic.rs
@@ -2,7 +2,8 @@
 //@ has - '//h3[@class="code-header"]' 'impl<T> Send for Foo<T>where T: Send'
 //@ has - '//h3[@class="code-header"]' 'impl<T> Sync for Foo<T>where T: Sync'
 //@ count - '//*[@id="implementations-list"]//*[@class="impl"]' 0
-//@ count - '//*[@id="synthetic-implementations-list"]//*[@class="impl"]' 6
+//@ count - '//*[@id="synthetic-implementations-list"]//*[@class="impl"]' 7
+// The number here will need updating when new auto traits are added:     ^
 pub struct Foo<T> {
     field: T,
 }
diff --git a/tests/rustdoc-html/synthetic_auto/manual.rs b/tests/rustdoc-html/synthetic_auto/manual.rs
index bbf361a6e596..830bfccca09e 100644
--- a/tests/rustdoc-html/synthetic_auto/manual.rs
+++ b/tests/rustdoc-html/synthetic_auto/manual.rs
@@ -6,7 +6,8 @@
 // 'impl<T> Send for Foo<T>'
 //
 //@ count - '//*[@id="trait-implementations-list"]//*[@class="impl"]' 1
-//@ count - '//*[@id="synthetic-implementations-list"]//*[@class="impl"]' 5
+//@ count - '//*[@id="synthetic-implementations-list"]//*[@class="impl"]' 6
+// The number here will need updating when new auto traits are added:     ^
 pub struct Foo<T> {
     field: T,
 }