Update equality.md

Author: bowbahdoe

src/strings/equality.md

@@ -31,3 +31,7 @@ boolean areNotSame = !bow.equals(wow);
 IO.println(areNotSame);
 ~}
 ```
+
+Note that you should **not** use `==`. Java will let you do it but you won't get what you expect.[^inaway]
+
+[^inaway]: It is confusing in a way that we aren't ready to explain yet. Just remember for `int`, `double`, `char`, etc. you can use `==`. For `String` use `.equals`.