diff --git a/main.py b/main.py
index 5ef7e45..f10928f 100644
--- a/main.py
+++ b/main.py
@@ -44,23 +44,23 @@ class DBConn:
             print(f"create sql = {create_tbl_sql}")
         self.cur.execute(create_tbl_sql)
 
-    def write_to_database(self, tbl, cols):
-        keys = cols.keys()  # OrderedDict
+    def write_to_database(self, tbl, column_data):
+        col_names = column_data.keys()  # OrderedDict
 
         col_names = ', '.join(
-            [f"\"{x}\"" for x in keys]
+            [f"\"{x}\"" for x in col_names]
         )
         value_placeholders = ', '.join(
-            ["?" for _ in keys]
+            ["?" for _ in col_names]
         )
         # trim values of spaces
-        values = tuple([str(cols[k]).strip() for k in keys])
+        values = tuple([str(column_data[k]).strip() for k in col_names])
 
         # there might be a scenario that new cols might appear at a later stage, if so,
         # we shall accommodate by adding it to the database
         tbl_cols = self.table_mapping[tbl]
         not_found = []
-        for col in cols:
+        for col in col_names:
             if col not in tbl_cols:
                 not_found.append(col)
 
@@ -69,7 +69,7 @@ class DBConn:
                 self.cur.execute(f"alter table \"{tbl}\" add column \"{new_col}\" text")
 
             print(f"added {not_found} cols to {tbl}")
-            self.table_mapping[tbl] = cols
+            self.table_mapping[tbl] = column_data
 
         sql = f"insert into \"{tbl}\" ({col_names}) values({value_placeholders})"
         self.cur.execute(sql, values)