diff --git a/services/kms/model_create_key_payload.go b/services/kms/model_create_key_payload.go
index 848396678..3bc1a135f 100644
--- a/services/kms/model_create_key_payload.go
+++ b/services/kms/model_create_key_payload.go
@@ -166,7 +166,7 @@ type CreateKeyPayload struct {
 	Algorithm CreateKeyPayloadGetAlgorithmAttributeType `json:"algorithm" required:"true"`
 	// A user chosen description to distinguish multiple keys.
 	Description CreateKeyPayloadGetDescriptionAttributeType `json:"description,omitempty"`
-	// The display name to distinguish multiple keys.
+	// The display name to distinguish multiple keys. Valid characters: letters, digits, underscores and hyphens.
 	// REQUIRED
 	DisplayName CreateKeyPayloadGetDisplayNameAttributeType `json:"displayName" required:"true"`
 	// States whether versions can be created or only imported.
diff --git a/services/kms/model_create_key_ring_payload.go b/services/kms/model_create_key_ring_payload.go
index 28356d7c5..22316db1d 100644
--- a/services/kms/model_create_key_ring_payload.go
+++ b/services/kms/model_create_key_ring_payload.go
@@ -63,7 +63,7 @@ type CreateKeyRingPayloadGetDisplayNameRetType = string
 type CreateKeyRingPayload struct {
 	// A user chosen description to distinguish multiple key rings.
 	Description CreateKeyRingPayloadGetDescriptionAttributeType `json:"description,omitempty"`
-	// The display name to distinguish multiple key rings.
+	// The display name to distinguish multiple key rings. Valid characters: letters, digits, underscores and hyphens.
 	// REQUIRED
 	DisplayName CreateKeyRingPayloadGetDisplayNameAttributeType `json:"displayName" required:"true"`
 }
diff --git a/services/kms/model_create_wrapping_key_payload.go b/services/kms/model_create_wrapping_key_payload.go
index 45d3600c1..5d9a36f01 100644
--- a/services/kms/model_create_wrapping_key_payload.go
+++ b/services/kms/model_create_wrapping_key_payload.go
@@ -146,7 +146,7 @@ type CreateWrappingKeyPayload struct {
 	Algorithm CreateWrappingKeyPayloadGetAlgorithmAttributeType `json:"algorithm" required:"true"`
 	// A user chosen description to distinguish multiple wrapping keys.
 	Description CreateWrappingKeyPayloadGetDescriptionAttributeType `json:"description,omitempty"`
-	// The display name to distinguish multiple wrapping keys.
+	// The display name to distinguish multiple wrapping keys. Valid characters: letters, digits, underscores and hyphens.
 	// REQUIRED
 	DisplayName CreateWrappingKeyPayloadGetDisplayNameAttributeType `json:"displayName" required:"true"`
 	// REQUIRED