diff --git a/decor/on_condition.go b/decor/on_condition.go
index a9db065..74a3d96 100644
--- a/decor/on_condition.go
+++ b/decor/on_condition.go
@@ -1,27 +1,55 @@
 package decor
 
-// OnPredicate returns decorator if predicate evaluates to true.
+// OnCondition applies decorator only if a condition is true.
+//
+//	`decorator` Decorator
+//
+//	`cond` bool
+//
+func OnCondition(decorator Decorator, cond bool) Decorator {
+	return Conditional(cond, decorator, nil)
+}
+
+// OnPredicate applies decorator only if a predicate evaluates to true.
 //
 //	`decorator` Decorator
 //
 //	`predicate` func() bool
 //
 func OnPredicate(decorator Decorator, predicate func() bool) Decorator {
-	if predicate() {
-		return decorator
-	}
-	return nil
+	return Predicative(predicate, decorator, nil)
 }
 
-// OnCondition returns decorator if condition is true.
-//
-//	`decorator` Decorator
+// Conditional returns decorator `a` if condition is true, otherwise
+// decorator `b`.
 //
 //	`cond` bool
 //
-func OnCondition(decorator Decorator, cond bool) Decorator {
+//	`a` Decorator
+//
+//	`b` Decorator
+//
+func Conditional(cond bool, a, b Decorator) Decorator {
 	if cond {
-		return decorator
+		return a
+	} else {
+		return b
 	}
-	return nil
 }
+
+// Predicative returns decorator `a` if predicate evaluates to true,
+// otherwise decorator `b`.
+//
+//	`predicate` func() bool
+//
+//	`a` Decorator
+//
+//	`b` Decorator
+//
+func Predicative(predicate func() bool, a, b Decorator) Decorator {
+	if predicate() {
+		return a
+	} else {
+		return b
+	}
+}