diff --git a/emer/layer.go b/emer/layer.go
index a955803..e6db55f 100644
--- a/emer/layer.go
+++ b/emer/layer.go
@@ -36,12 +36,10 @@ type Layer interface {
 	// SetName sets name of layer
 	SetName(nm string)
 
-	// SetClass sets CSS-style class name(s) for this layer (space-separated if multiple)
-	SetClass(cls string)
-
 	// AddClass adds a CSS-style class name(s) for this layer,
 	// ensuring that it is not a duplicate, and properly space separated.
-	AddClass(cls string)
+	// Returns Layer so it can be chained to set other properties too
+	AddClass(cls ...string) Layer
 
 	// IsOff returns true if layer has been turned Off (lesioned) -- for experimentation
 	IsOff() bool
diff --git a/emer/prjn.go b/emer/prjn.go
index 29a3d62..5b8ac99 100644
--- a/emer/prjn.go
+++ b/emer/prjn.go
@@ -52,13 +52,10 @@ type Prjn interface {
 	// Connect sets the basic connection parameters for this projection (send, recv, pattern, and type)
 	// Connect(send, recv Layer, pat prjn.Pattern, typ PrjnType)
 
-	// SetClass sets CSS-style class name(s) for this projection (space-separated if multiple)
-	// Returns Prjn so it can be chained to set other properties too
-	SetClass(cls string) Prjn
-
 	// AddClass adds a CSS-style class name(s) for this prjn,
 	// ensuring that it is not a duplicate, and properly space separated.
-	AddClass(cls string)
+	// Returns Prjn so it can be chained to set other properties too
+	AddClass(cls ...string) Prjn
 
 	// Label satisfies the gi.Labeler interface for getting the name of objects generically
 	Label() string
diff --git a/params/styler.go b/params/styler.go
index 3ed26c7..4d14e64 100644
--- a/params/styler.go
+++ b/params/styler.go
@@ -40,16 +40,17 @@ type StylerObj interface {
 	Object() any
 }
 
-// AddClass adds given class to current class string,
+// AddClass adds given class(es) to current class string,
 // ensuring it is not a duplicate of existing, and properly
 // adding spaces
-func AddClass(cur, class string) string {
-	if ClassMatch(cur, class) {
+func AddClass(cur string, class ...string) string {
+	cls := strings.Join(class, " ")
+	if ClassMatch(cur, cls) {
 		return cur
 	}
 	cur = strings.TrimSpace(cur)
 	if len(cur) == 0 {
-		return class
+		return cls
 	}
-	return cur + " " + class
+	return cur + " " + cls
 }