diff --git a/marc_tools/marc_extractor.py b/marc_tools/marc_extractor.py
index c3a49f62de4012ed2afa6ab7e51394cb9d428aaf..a6c6dbbde87594728648aa85d8e1e6a5f44bf4f2 100644
--- a/marc_tools/marc_extractor.py
+++ b/marc_tools/marc_extractor.py
@@ -29,9 +29,8 @@ class SelectorPredicate:
 
 class SingleCommand(ParseCommand):
     # Testing the input of the patterns, we can either have:
-    # * tag only
+    # * tag only (if it is a controlfield, like 009)
     # * tag with inds only
-    # * tag with subfield only or
     # * tag with both inds and subfield
     # Indicators must always be given in pairs, blank-separated
     pat_tag = re.compile(r"^(\d{3}|AVA)( ([0-9_*]) ([0-9_*]))?"