diff --git a/api/src/main/kotlin/dev/bpmcrafters/processengineapi/CommonRestrictions.kt b/api/src/main/kotlin/dev/bpmcrafters/processengineapi/CommonRestrictions.kt
index 11c1d05b..c2b1b11f 100644
--- a/api/src/main/kotlin/dev/bpmcrafters/processengineapi/CommonRestrictions.kt
+++ b/api/src/main/kotlin/dev/bpmcrafters/processengineapi/CommonRestrictions.kt
@@ -11,6 +11,13 @@ object CommonRestrictions {
    */
   const val ACTIVITY_ID = "activityId"
 
+  /**
+   * Id of the runtime instance of a BPMN activity. Key under which adapters can put it into
+   * [dev.bpmcrafters.processengineapi.task.TaskInformation.meta], e.g. for log or trace correlation.
+   * @since 1.8
+   */
+  const val ACTIVITY_INSTANCE_ID = "activityInstanceId"
+
   /**
    * Logical business key.
    */