diff --git a/docs/Learning-Environment-Create-New.md b/docs/Learning-Environment-Create-New.md
index df4deef039..e32a9b9510 100644
--- a/docs/Learning-Environment-Create-New.md
+++ b/docs/Learning-Environment-Create-New.md
@@ -413,6 +413,7 @@ RollerBall:
   learning_rate: 3.0e-4
   learning_rate_schedule: linear
   max_steps: 5.0e4
+  memory_size: 128
   normalize: false
   num_epoch: 3
   num_layers: 2