diff --git a/examples/HorizontalCell.py b/examples/HorizontalCell.py
index fc3fbca..1d71008 100644
--- a/examples/HorizontalCell.py
+++ b/examples/HorizontalCell.py
@@ -203,7 +203,7 @@
     mosaic = pattern.new_mosaic(scope=scope)
     mosaic, losses = pattern.simulate(mosaic=mosaic, interaction_func=h_func, 
                                       features=None, schedule=AdaptiveSchedule(), 
-                                      max_step=None, update_ratop=None, 
+                                      max_step=None, update_ratio=None, 
                                       save_prefix="examples/simulated/HC/Sample", 
                                       save_step=500, verbose=True)
     mosaic.draw_points()
diff --git a/scripts/parallel_simulate.py b/scripts/parallel_simulate.py
index 6278fc9..5298424 100644
--- a/scripts/parallel_simulate.py
+++ b/scripts/parallel_simulate.py
@@ -3,7 +3,7 @@
 # select the pattern
 from examples.HorizontalCell import pattern as HC
 from examples.HorizontalCell import scope, h_func
-features = ["nn", "vd"]
+features = ["NN", "VD"]
 # set output files
 save_prefix = "examples/simulated/HC/W1"
 # chose a random seed
diff --git a/tutorial/estimate_inter_ps.md b/tutorial/estimate_inter_ps.md
index 74e5296..c530c55 100644
--- a/tutorial/estimate_inter_ps.md
+++ b/tutorial/estimate_inter_ps.md
@@ -22,7 +22,7 @@ The estimation requires the [spatstat](https://spatstat.org/) libaray in [R](htt
 install.packages('spatstat')
 ```
 
-We recommend learning the basic of the `R` language for further usage. In this part, we suppose you know the basic of a retinal mosaic and the usage of the `OPIPP` module. Furthermore, you need to modify R scripts for your simulations.
+Here, we suppose you know the basic of a retinal mosaic and the usage of the `OPIPP` module. Furthermore, you need to modify R scripts for your applications. Therefore, We recommend learning the basic of the `R` language for further usage. 
 
 # Save points into local files