Update README with known issue #18

README.md

@@ -184,6 +184,13 @@ true   | _Default_. Status symbols (`≡` `↑` `↓` `↕`) will be shown.
 false  | No status symbol will be shown, saving some prompt length.
 
 
+Known issues
+------------
+
+### Terminal.app
+
+When using Terminal.app, when the prompt is longer than the terminal window width, the prompt line may not wrap correctly to the next line. This is suspected to be caused by incorrect handling of ANSI color codes by Terminal.app. See issue #18.
+
 Background
 ----------