diff --git a/Readme.md b/Readme.md
index b53cb8a..211c1a5 100644
--- a/Readme.md
+++ b/Readme.md
@@ -3,7 +3,7 @@ Cursive
 
 Cursive is a ncurses-based TUI (Text User Interface) library for rust. It is based on jeaye's [ncurses-rs](https://github.com/jeaye/ncurses-rs).
 
-It is designed to be safe, and easy to use:
+It is designed to be safe and easy to use:
 
 ```rust
 extern crate cursive;
@@ -14,9 +14,14 @@ fn main() {
 	let mut siv = Cursive::new();
 
 	// Create a popup window with a "Ok" button that quits the application
-	siv.add_layer(Dialog::new("Hello world!").button("Ok", |s| s.quit()));
+	siv.add_layer(Dialog::new("Hello world!").button("Ok", |s, _| s.quit()));
 
 	// Starts the event loop.
 	siv.run();
 }
 ```
+
+A few notes :
+
+* The main focus point is _not_ performance. This is a simple layout library, guys, not [compiz](https://www.google.com/search?q=compiz&tbm=isch) piped into [libcaca](https://www.google.com/search?q=libcaca&tbm=isch). Unless you are running it on your microwave's microcontroller, it's not going to be slow.
+* The library is single-threaded. Thus, callback methods are blocking - careful what you're doing in there! Feel free to use threads on your side, though.