diff --git a/events/cognito.go b/events/cognito.go
index 0b350a90..7c9d8694 100644
--- a/events/cognito.go
+++ b/events/cognito.go
@@ -359,7 +359,10 @@ type CognitoEventUserPoolsCustomMessageRequest struct {
 	UserAttributes    map[string]interface{} `json:"userAttributes"`
 	CodeParameter     string                 `json:"codeParameter"`
 	UsernameParameter string                 `json:"usernameParameter"`
-	ClientMetadata    map[string]string      `json:"clientMetadata"`
+	// LinkParameter is the placeholder for the verification link in email messages.
+	// It is present when TriggerSource is CustomMessage_VerifyUserAttribute or CustomMessage_AdminCreateUser.
+	LinkParameter  string            `json:"linkParameter,omitempty"`
+	ClientMetadata map[string]string `json:"clientMetadata"`
 }
 
 // CognitoEventUserPoolsCustomMessageResponse contains the response portion of a CustomMessage event
diff --git a/events/testdata/cognito-event-userpools-custommessage.json b/events/testdata/cognito-event-userpools-custommessage.json
index 9c10d794..8b0c2565 100644
--- a/events/testdata/cognito-event-userpools-custommessage.json
+++ b/events/testdata/cognito-event-userpools-custommessage.json
@@ -15,6 +15,7 @@
        },
       "codeParameter": "####",
       "usernameParameter": "{username}",
+      "linkParameter": "https://example.com/verify?token=abc123",
       "clientMetadata": {
         "exampleMetadataKey": "example metadata value"
       }