diff --git a/examples/ttl.py b/examples/ttl.py
index 7c38c80..af5cdd2 100644
--- a/examples/ttl.py
+++ b/examples/ttl.py
@@ -88,5 +88,5 @@ class ShortPulse(EnvExperiment):
     @kernel
     def run(self):
         self.core.reset()
-        delay(6*ns)
-        self.ttl0.pulse(3*ns)
+        delay(6*ns)             # Coarse RTIO period: 0 - 7  ns
+        self.ttl0.pulse(3*ns)   # Coarse RTIO period: 8 - 15 ns