diff --git a/docs/18170_run_notes.md b/docs/18170_run_notes.md
index d42e1401b396b95eaef78910c6f0f85503432298..983a0652f4b906666327c2d6f5baff4bdaf7d0b1 100644
--- a/docs/18170_run_notes.md
+++ b/docs/18170_run_notes.md
@@ -71,6 +71,12 @@ do
 done
 ```
 
+Re-generate the family ids list.
+
+```
+cut -f 1 /scratch/u035/project/trio_whole_exome/analysis/params/18170_Ansari_Morad.ped > 18170_Ansari_Morad.family_ids.txt
+```
+
 Edit the parameter generation script to skip running the Perl script for producing the PED files.
 
 ```