diff --git a/front-end/studio/src/app/components/common/activity-item.component.ts b/front-end/studio/src/app/components/common/activity-item.component.ts
index 53e731a2c..512293cdf 100644
--- a/front-end/studio/src/app/components/common/activity-item.component.ts
+++ b/front-end/studio/src/app/components/common/activity-item.component.ts
@@ -133,6 +133,7 @@ export class ActivityItemComponent {
             case "ChangeLicenseCommand_30":
                 rval = "copyright";
                 break;
+            case "ChangeHeadersRefCommand_Aai20":
             case "ChangeMediaTypeTypeCommand":
             case "ChangeParameterDefinitionTypeCommand":
             case "ChangeParameterDefinitionTypeCommand_20":
@@ -428,6 +429,9 @@ export class ActivityItemComponent {
             case "ChangeDescriptionCommand_30":
                 rval = "altered the API's description.";
                 break;
+            case "ChangeHeadersRefCommand_Aai20":
+                rval = "changed the header of message at location " + this.command()["_messagePath"] + " to " + this.command()["_headersRef"] + ".";
+                break;
             case "ChangeLicenseCommand":
             case "ChangeLicenseCommand_20":
             case "ChangeLicenseCommand_30":