diff --git a/ib-clearance.py b/ib-clearance.py
index 3168767..ba18f3e 100755
--- a/ib-clearance.py
+++ b/ib-clearance.py
@@ -68,7 +68,7 @@ def get_data(conn):
         return get_data(conn)
 
 
-def select_final_time(conn, day, stuple):
+def select_final_time(conn, day, data):
     """Select student finishing time.
 
     Returns ending time (type struct_time) of final lesson student must
@@ -76,7 +76,7 @@ def select_final_time(conn, day, stuple):
 
     :param conn: Connection object
     :param day: current weekday, lowercase str
-    :param stuple: student data tuple returned by get_data
+    :param data: student data tuple returned by get_data
     """
     cur = conn.cursor()
     # Select finishing time of IB lessons.
@@ -94,14 +94,14 @@ def select_final_time(conn, day, stuple):
             AND lesson_class = ?
         ORDER BY end_time DESC
         LIMIT 1
-        """, (stuple[0], day, stuple[1]))  # Queries return None if no matches.
+        """, (data[0], day, data[1]))  # Queries return None if no matches.
     ib_finish = cur.fetchone()
     if ib_finish is not None:
         ib_finish = parse_time_string(ib_finish[0])
 
     # Select finishing time of other lessons.
     others = []
-    for subject in stuple[2]:
+    for subject in data[2]:
         cur.execute("""
             SELECT end_time
             FROM timetable
@@ -111,7 +111,7 @@ def select_final_time(conn, day, stuple):
                 AND lesson_class = ?
             ORDER BY end_time DESC
             LIMIT 1
-            """, (subject, stuple[0], day, stuple[1]))
+            """, (subject, data[0], day, data[1]))
         subject_finish = cur.fetchone()
         if subject_finish is not None:
             others.append(parse_time_string(subject_finish[0]))