diff --git a/README.adoc b/README.adoc
index 19d8276..8baeee6 100644
--- a/README.adoc
+++ b/README.adoc
@@ -12054,6 +12054,10 @@ The exact same can be achieved with the older hardcoded `--maxinsts` mechanism p
 ;
 ....
 
+Other related fs.py options are:
+
+* `--abs-max-tick`: set the maximum number of ticks rather than instructions
+
 The message also shows on <<user-mode-simulation>> deadlocks, for example in link:userland/posix/pthread_deadlock.c[]:
 
 ....