Correct comment for patterns

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_*]))?"