diff --git a/image_prediction/image_extractor/extractors/parsable.py b/image_prediction/image_extractor/extractors/parsable.py
index a847e17..805adc8 100644
--- a/image_prediction/image_extractor/extractors/parsable.py
+++ b/image_prediction/image_extractor/extractors/parsable.py
@@ -111,6 +111,7 @@ def get_metadata_for_images_on_page(page: fitz.Page):
 
 def filter_valid_metadata(metadata):
     yield from compose(
+        # filter_out_page_sized_images, TODO: Link to concept for extraction toggling and reclassification endpoint
         filter_out_tiny_images,
         filter_invalid_metadata,
     )(metadata)
@@ -135,8 +136,10 @@ def get_image_infos(page: fitz.Page) -> List[dict]:
 
 @lru_cache(maxsize=None)
 def xref_to_image(doc, xref) -> Image:
+    # NOTE: image extraction is done via pixmap to array, as this method is twice as fast as extraction via bytestream
     pixmap = fitz.Pixmap(doc, xref)
     array = np.frombuffer(pixmap.samples, dtype=np.uint8).reshape(pixmap.h, pixmap.w, pixmap.n)
+    # TODO: Find a better solution: PIL.Image.fromarray doesn't take grayscale images of the shape (h, w, 1) but (h, w)
     array = array[:, :, 0] if array.shape[2] == 1 else array
     return Image.fromarray(array)