diff --git a/packages/mermaid/src/config.type.ts b/packages/mermaid/src/config.type.ts
index 86281cd52..ff547eeec 100644
--- a/packages/mermaid/src/config.type.ts
+++ b/packages/mermaid/src/config.type.ts
@@ -546,6 +546,10 @@ export interface JourneyDiagramConfig extends BaseDiagramConfig {
    * Margin between actors
    */
   leftMargin?: number;
+  /**
+   * Maximum width of actor labels
+   */
+  maxLabelWidth?: number;
   /**
    * Width of actor boxes
    */