diff --git a/functions.py b/functions.py
index a58bfe7..23d6ef8 100644
--- a/functions.py
+++ b/functions.py
@@ -21,5 +21,9 @@ def scatter_data(data,variable_1=None,variable_2=None):
     data.plot.scatter(x=variable_1,y=variable_2)
     
     
-
+def scatter_data(data,variable_1=None,variable_2=None):
+    if (variable_1 is None) or (variable_2 is None):
+        print('please provide two variable names!')
+        return
+    data.plot.scatter(x=variable_2,y=variable_1)
     
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