diff --git a/README.md b/README.md
index 7a419a6..164fc79 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,7 @@ Usage: ./SOCgen -n <order> [-r <num>] [--graphviz] [FILTER ...]
        -c             ... that are cyclic (i.e., not DAGs)
        --no-sink      ... without sink nodes (this logically implies -c)
        --no-source    ... without source nodes (also this logically implies -c)
+       --chordless    ... without cycles that have chords (this is incompatible with --no-source, see paper)
 
 This program prints the found SOCs as adjacency matrices to stdout, unless --graphviz has been specified.
 To exclude (some) of the isomorphic SOCs, it uses a degree-order filter, unless --all is specified.