diff --git a/core/src/main/kotlin/net/corda/core/flows/InitiatedBy.kt b/core/src/main/kotlin/net/corda/core/flows/InitiatedBy.kt
index a5f9c709a2..8ad0fb2fc0 100644
--- a/core/src/main/kotlin/net/corda/core/flows/InitiatedBy.kt
+++ b/core/src/main/kotlin/net/corda/core/flows/InitiatedBy.kt
@@ -15,4 +15,5 @@ import kotlin.reflect.KClass
  * @see InitiatingFlow
  */
 @Target(CLASS)
+@MustBeDocumented
 annotation class InitiatedBy(val value: KClass<out FlowLogic<*>>)
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