diff --git a/DAS/simulator.py b/DAS/simulator.py
index fddaaa9..7bc91bf 100644
--- a/DAS/simulator.py
+++ b/DAS/simulator.py
@@ -60,7 +60,7 @@ class Simulator:
             rows =    list(range(self.shape.blockSizeC)) * (int(totalRows/self.shape.blockSizeC)+1)
             columns = list(range(self.shape.blockSizeR)) * (int(totalColumns/self.shape.blockSizeR)+1)
             rows =    rows[0:totalRows]
-            columns = columns[0:totalRows]
+            columns = columns[0:totalColumns]
             random.shuffle(rows)
             random.shuffle(columns)
             offsetR = lightVal*self.shape.chiR
diff --git a/README.md b/README.md
index 97846ce..e4e9841 100644
--- a/README.md
+++ b/README.md
@@ -22,5 +22,5 @@ $ pip3 install -r DAS/requirements.txt
 ## Run the simulator
 
 ```
-$ python3 study.py config.das
+$ python3 study.py smallConf.py
 ```