diff --git a/pubs/plugs/extract/annotation.py b/pubs/plugs/extract/annotation.py
index 0baefbb..a12dec8 100644
--- a/pubs/plugs/extract/annotation.py
+++ b/pubs/plugs/extract/annotation.py
@@ -87,7 +87,8 @@ class Annotation:
     def colorname(self):
         """Return the stringified version of the annotation color.
 
-        Finds the closest named color to the annotation and returns it.
+        Finds the closest named color to the annotation and returns it,
+        using euclidian distance between the two color vectors.
         """
         annot_colors = (
             self.colors.get("stroke") or self.colors.get("fill") or (0.0, 0.0, 0.0)
diff --git a/pubs/plugs/extract/extract.py b/pubs/plugs/extract/extract.py
index c513813..e5c356d 100644
--- a/pubs/plugs/extract/extract.py
+++ b/pubs/plugs/extract/extract.py
@@ -225,7 +225,8 @@ class ExtractPlugin(PapersPlugin):
         that is only the written words, sometimes that is only
         annotation notes, sometimes it is both. Runs a similarity
         comparison between strings to find out whether they
-        should both be included or are doubling up.
+        should both be included or are doubling up, using
+        Levenshtein distance.
         """
         content = annotation.info["content"].replace("\n", " ")
         written = page.get_textbox(annotation.rect).replace("\n", " ")