diff --git a/CHANGES b/CHANGES
index 4568845a5b..b9e4a349c5 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,5 @@
+6334.	[doc]		Improve ARM parental-agents definition. [GL #4531]
+
 6333.	[bug]		Fix the DNS_GETDB_STALEFIRST flag, which was defined
 			incorrectly in lib/ns/query.c. [GL !8683]
 
diff --git a/doc/arm/reference.rst b/doc/arm/reference.rst
index 3ebcfc82a5..5949ec14bd 100644
--- a/doc/arm/reference.rst
+++ b/doc/arm/reference.rst
@@ -1060,10 +1060,10 @@ responses such as NXDOMAIN.
 :any:`parental-agents` Block Definition and Usage
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-:any:`parental-agents` lists allow for a common set of parental agents to be easily
-used by multiple primary and secondary zones.
-A parental agent is the entity that is allowed to
-change a zone's delegation information (defined in :rfc:`7344`).
+:any:`parental-agents` lists allow for a common set of parental agents to be
+easily used by multiple primary and secondary zones. A "parental agent" is a
+trusted DNS server that is queried to check if DS records for a given zones
+are up-to-date.
 
 :any:`primaries` Block Grammar
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~