diff --git a/docs/mithril.deferred.md b/docs/mithril.deferred.md
index 4b90ea01..69120a21 100644
--- a/docs/mithril.deferred.md
+++ b/docs/mithril.deferred.md
@@ -163,7 +163,7 @@ The other side of the coin is still supported: if a developer needs to signal an
 var error = m.prop()
 m.request({method: "GET", url: "/user/:id", data: {id: 1}})
 	.then(function(user) {
-		if (user.isAdmin) throw new Error("Sorry, you don't have permissions")
+		if (!user.isAdmin) throw new Error("Sorry, you don't have permissions")
 	})
 	.then(null, error) //handle the application error: bind to a getter-setter for diplaying it on the template
 ```
@@ -249,4 +249,4 @@ where:
 
 	**void onerror(Error e)**
 
-	This method gets called every time an exception is thrown inside a promise callback. By default, it rethrows to the console if an error is a subclass of Error (but not an instance of Error itself). Otherwise it follows the Promises/A+ specifications.
\ No newline at end of file
+	This method gets called every time an exception is thrown inside a promise callback. By default, it rethrows to the console if an error is a subclass of Error (but not an instance of Error itself). Otherwise it follows the Promises/A+ specifications.