diff --git a/src/main/asciidoc/reference/mapping.adoc b/src/main/asciidoc/reference/mapping.adoc
index 048b0d687..4bcc471eb 100644
--- a/src/main/asciidoc/reference/mapping.adoc
+++ b/src/main/asciidoc/reference/mapping.adoc
@@ -395,9 +395,6 @@ public class LoginEvent {
 ----
 ====
 
-NOTE: `PrimaryKeyClass` must implement `Serializable` and should provide implementations of `equals()` and `hashCode()`.
-
-
 [[mapping.usage-annotations]]
 === Mapping Annotation Overview