diff --git a/README.md b/README.md
index 9f0f59c..bfc20f4 100644
--- a/README.md
+++ b/README.md
@@ -45,3 +45,8 @@ pibs -r pcapfile.cap -d
 
 Dump the internal data structures for debugging purposes from the processing
 of the pcapfile.
+
+pibs -n
+
+Create fresh internal data structure as shared memory for multi processing
+purposes. The segment id is displayed on standard output.