diff --git a/ch2/detector/detector.go b/ch2/detector/detector.go
index 3e4498c..540fade 100644
--- a/ch2/detector/detector.go
+++ b/ch2/detector/detector.go
@@ -397,7 +397,7 @@ func (ss *Sim) ConfigGUI() {
 	ss.GUI.CycleUpdateInterval = 10
 
 	nv := ss.GUI.AddNetView("Network")
-	nv.Params.MaxRecs = 300
+	nv.Options.MaxRecs = 300
 	nv.SetNet(ss.Net)
 	ss.ViewUpdate.Config(nv, etime.Cycle, etime.Cycle)
 	ss.GUI.ViewUpdate = &ss.ViewUpdate
diff --git a/ch3/faces/faces.go b/ch3/faces/faces.go
index 5e8aa66..9e4aef2 100644
--- a/ch3/faces/faces.go
+++ b/ch3/faces/faces.go
@@ -571,7 +571,7 @@ func (ss *Sim) ConfigGUI() {
 	ss.GUI.CycleUpdateInterval = 10
 
 	nv := ss.GUI.AddNetView("Network")
-	nv.Params.MaxRecs = 300
+	nv.Options.MaxRecs = 300
 	nv.SetNet(ss.Net)
 	ss.ViewUpdate.Config(nv, etime.Cycle, etime.Cycle)
 	ss.GUI.ViewUpdate = &ss.ViewUpdate