diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index a387aabcea..a1c6a8259e 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -203,7 +203,19 @@ and L</New Warnings>
 
 =item *
 
-XXX L<message|perldiag/"message">
+L<Cannot create an object of incomplete class "%s"|perldiag/"Cannot create an object of incomplete class "%s"">
+
+(F) An attempt was made to create an object of a class where the start
+of the class definition has been seen, but the class has not been
+completed.
+
+This can happen for a failed eval, or if you attempt to create an
+object at compile time before the class is complete:
+
+  eval "class Foo {"; Foo->new; # error
+  class Bar { BEGIN { Bar->new } }; # error
+
+Previously perl would assert or crash. [github #22159]
 
 =back