diff --git a/comic2pdf.py b/comic2pdf.py
index 6e0b77e..5ba53fb 100755
--- a/comic2pdf.py
+++ b/comic2pdf.py
@@ -58,6 +58,9 @@ class Comic2PDF:
             queue = 1
             scanned_folder = self.scan(self.src)
             log.debug(f"scanned folder: {scanned_folder}")
+
+            # BUG
+            # batch conversion is probably recursive
             for root, dirs, files in os.walk(self.src):
                 for file in files:
                     txt = f" [{queue}/{len(scanned_folder)}] Progress "
@@ -83,6 +86,8 @@ class Comic2PDF:
         log.info(f"Scanning {dir}")
 
         files_in_folder = []
+        # TODO
+        # replace os.walk() for more flexibility
 
         for root, dirs, files in os.walk(dir):
             for name in files:
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index fb5a4e2..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-img2pdf==0.4.4
-patool==1.12
-Send2Trash==1.8.0
-tqdm==4.64.1