diff --git a/containers/containers.go b/containers/containers.go
index c624164e8..e6a562730 100644
--- a/containers/containers.go
+++ b/containers/containers.go
@@ -40,7 +40,7 @@ type Container struct {
 
 	// Image specifies the image reference used for a container.
 	//
-	// This property is optional but immutable.
+	// This property is optional and mutable.
 	Image string
 
 	// Runtime specifies which runtime should be used when launching container
@@ -60,7 +60,7 @@ type Container struct {
 	// look up the mounts from the snapshot service and include those on the
 	// task create request.
 	//
-	// This field is not required but immutable.
+	// This field is not required but mutable.
 	SnapshotKey string
 
 	// Snapshotter specifies the snapshotter name used for rootfs