diff --git a/tools/sort_map.py b/tools/sort_map.py
index a5202e8e6..116fbb172 100644
--- a/tools/sort_map.py
+++ b/tools/sort_map.py
@@ -28,7 +28,7 @@ def total_bank_size(type):
 def map_to_sym(input):
 	# analogous to ";File generated by rgblink"
 	yield ';File generated by sort_map.py\n'
-	
+
 	# ex: OAM:
 	unused_rx = re.compile(r'^([A-Z]+):$')
 	# ex: ROM Bank #1:
@@ -43,8 +43,8 @@ def map_to_sym(input):
 	bank_type = None
 	bank_number = None
 	bank_size = 0
-	bank_queue = []
-	section_queue = []
+	bank_lines = []
+	section_lines = []
 
 	for line in input:
 
@@ -58,8 +58,8 @@ def map_to_sym(input):
 			bank_type = x.group(1)
 			bank_number = '00'
 			bank_size = 0
-			del bank_queue[:]
-			del section_queue[:]
+			del bank_lines[:]
+			del section_lines[:]
 			continue
 
 		x = re.match(bank_rx, line)
@@ -72,22 +72,23 @@ def map_to_sym(input):
 			if bank_type == 'WRAM':
 				bank_type = 'WRAM0' if bank_number == '00' else 'WRAMX'
 			bank_size = 0
-			del bank_queue[:]
-			del section_queue[:]
+			del bank_lines[:]
+			del section_lines[:]
 			continue
 
 		x = re.match(section_rx, line)
 		if x:
 			# finish current section
-			bank_queue.extend(sorted(section_queue))
+			bank_lines.extend(sorted(section_lines))
 			# start a new section
 			start = x.group(1)
 			end = x.group(2) or start
 			size = x.group(3).zfill(4)
 			name = x.group(4)
 			bank_size += int(size, 16)
-			bank_queue.append('; %s:%s-%s ($%s) %s\n' % (bank_number, start, end, size, name))
-			del section_queue[:]
+			# ex: ; ROMX $01 ($347B) ($0B85 free)
+			bank_lines.append('; %s:%s-%s ($%s) %s\n' % (bank_number, start, end, size, name))
+			del section_lines[:]
 			continue
 
 		x = re.match(label_rx, line)
@@ -95,17 +96,19 @@ def map_to_sym(input):
 			# add label to section
 			address = x.group(1)
 			label = x.group(2)
-			section_queue.append('%s:%s %s\n' % (bank_number, address, label))
+			# ex: 01:4025 PlaceWaitingText.Waiting
+			section_lines.append('%s:%s %s\n' % (bank_number, address, label))
 			continue
 
 		x = re.match(slack_rx, line)
 		if x:
 			# finish current section
-			bank_queue.extend(sorted(section_queue))
+			bank_lines.extend(sorted(section_lines))
 			# finish current bank
 			slack = int(x.group(1), 16)
+			# ex: ; 01:4000-747A ($347B) bank1
 			yield '; %s $%s ($%04X) ($%04X free)\n' % (bank_type, bank_number, bank_size, slack)
-			for line in bank_queue:
+			for line in bank_lines:
 				yield line
 			continue
 
@@ -113,12 +116,10 @@ def main():
 	if len(sys.argv) < 3:
 		sys.stderr.write('Usage: %s pokecrystal.map sorted.sym\n' % sys.argv[0])
 		sys.exit(1)
-	input_filename = sys.argv[1]
-	output_filename = sys.argv[2]
-	with open(input_filename, 'r') as infile:
+	with open(sys.argv[1], 'r') as infile:
 		input = infile.readlines()
 		output = map_to_sym(input)
-	with open(output_filename, 'w') as outfile:
+	with open(sys.argv[2], 'w') as outfile:
 		outfile.writelines(output)
 
 if __name__ == '__main__':