Update usage.md

readme/usage.md

@@ -14,7 +14,7 @@ Hitting a key on the device that is selected in the large dropdown on the top
 should display the key on the bottom of the window, and write it into the selected
 row (as shown in the screenshots).
 
-In "Mapping", type the key to which you would like to map this key. You can also use [combinations](#combinations) or [macros](#macros). For all possible key names, see [Key Names](#key-names)
+In "Mapping", type the key to which you would like to map this key. You can also use [combinations](#writing-combinations) or [macros](#macros). For all possible key names, see [Key Names](#key-names)
 
 Changes are saved automatically. Afterwards press the "Apply" button.
 
@@ -39,15 +39,16 @@ Select the key in your row (`click here`) and hold a few buttons down.
 Releasing them will make your text cursor jump into the mapping column
 to type in what you want to map it to.
 
-Combinations involving Ctrl might not work, I think the desktop environment
-grabs them or something. Combinations with Shift might not work the way
-you would expect. If it outputs the keycode for a, you are going to get an
-'A', because X11 still sees the enabled shift button.
+Combinations involving Modifiers might not work. Configuring a combination
+of two keys to output a single key will require you to push down the first
+key, which of course ends up injecting that first key. Then the second key
+will trigger the mapping, because the combination is complete. This is
+not a bug. Otherwise every combination would have to automatically disable
+all keys that are involved in it.
 
-This happens, because all key-mapper does is either forwarding or mapping
-your keycodes (which is easier said than done), and X11/Wayland has to decide
-what to do with it. And it decides, that if shift is pressed down, it will
-capitalize your stuff.
+For example a combination of `LEFTSHIFT + a` for `b` would write "B" insetad,
+because shift will be activated before you hit the "a". Therefore the
+environment will see shift and a "b", which will then be capitalized.
 
 A better option for a key combination would be `KP1 + a` instead of 
 `LEFTSHIFT + a`, because there won't be any side effect. You can disable