Documentation overhaul

docs/stdlib/c64.md

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-[< back to index](../index.md)
+[< back to index](../README.md)
 
 # Commodore 64-oriented modules
 

docs/stdlib/cbm_file.md

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+[< back to index](../README.md)
 
 ## cbm_file
 

docs/stdlib/frequent.md

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-[< back to index](../index.md)
+[< back to index](../README.md)
 
 Definitions on the following list are frequently provided by the default automatically-imported modules. 
 

docs/stdlib/gb.md

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-[< back to index](../index.md)
+[< back to index](../README.md)
 
 # Game Boy–oriented modules
 

docs/stdlib/input.md

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-[< back to index](../index.md)
+[< back to index](../README.md)
 
 ## joy
 
 The module contains global variables representing the state of the one-button joystick.
 If the program is not using any joystick driver, the state of these variables is undefined.
 
+To actually use this module, an appropriate joystick module must be used, such as `c64_joy`, `nes_joy` or `gb_joy`.
+
 #### `sbyte input_dx`
 
 Horizontal joystick movement. 1 if right, -1 if left, 0 if neither.
@@ -36,6 +38,8 @@ The `mouse` module automatically imports the `x_coord` module.
 The module contains global variables representing the state of the mouse.
 If the program is not using any mouse driver, the state of these variables is undefined.
 
+To actually use this module, an appropriate mouse module must be used, such as `c1531`.
+
 #### `x_coord mouse_x`
 
 Mouse X position.

docs/stdlib/nes.md

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+[< back to index](../README.md)
 
 # NES/Famicom-oriented modules
 

docs/stdlib/other.md

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-[< back to index](../index.md)
+[< back to index](../README.md)
 
 ## keyboard
 

docs/stdlib/stdio.md

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+[< back to index](../README.md)
 
 ## stdio
 

docs/stdlib/stdlib.md

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+[< back to index](../README.md)
 
 ## stdlib
 

docs/stdlib/string.md

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+[< back to index](../README.md)
 
 ## string