Add an additional note about the handling of nonstandatd KGTK files.
@@ -367,6 +367,12 @@ kgtk cat -i ifexists-unmatched-filter.tsv --mode NONE
| zipcode | 62040 |
| zipcode | 72040 |
+!!! note
+ Since the filter file was missing a mandatory KGTK column (`node1`), the
+ matched and unmatched filter output files are also missing that
+ column. Thus, the `kgtk cat` commands that disply them also need
+ `--mode NONE`.
+
### Filter an Edge File By id
