diff --git a/Decide-Tests/SwiftUI_Tests.swift b/Decide-Tests/SwiftUI_Tests.swift
index bc18c1e..08b39f3 100644
--- a/Decide-Tests/SwiftUI_Tests.swift
+++ b/Decide-Tests/SwiftUI_Tests.swift
@@ -26,9 +26,13 @@ import DecideTesting
 
     struct ViewUnderTest: View {
         @BindKeyed(\State.$strMutable) var strMutable
+        @ObserveKeyed(\State.$str) var str
+        @ObserveKeyed(\State.$strMutable) var strMutableObserved
 
         var body: some View {
             TextField("", text: strMutable[1])
+            Text(str[1])
+            Text(strMutableObserved[1])
         }
     }
 
diff --git a/Decide/Accessor/SwiftUI/ObserveKeyed.swift b/Decide/Accessor/SwiftUI/ObserveKeyed.swift
index eef0f0e..34e9fc9 100644
--- a/Decide/Accessor/SwiftUI/ObserveKeyed.swift
+++ b/Decide/Accessor/SwiftUI/ObserveKeyed.swift
@@ -27,7 +27,13 @@ import SwiftUI
 
     let propertyKeyPath: KeyPath<S, Property<Value>>
 
-    public init(_ propertyKeyPath: KeyPath<S, Mutable<Value>>) {
+    public init(_ propertyKeyPath: KeyPath<S, Property<Value>>) {
+        self.propertyKeyPath = propertyKeyPath
+    }
+
+    public init<P: PropertyModifier>(
+        _ propertyKeyPath: KeyPath<S, P>
+    ) where P.Value == Value {
         self.propertyKeyPath = propertyKeyPath.appending(path: \.wrappedValue)
     }