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@@ -98,6 +98,26 @@ We've added shortcuts to make common modifier/tap (mod-tap) mappings more compac
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`DF(layer)` - sets default layer to *layer*. The default layer is the one at the "bottom" of the layer stack - the ultimate fallback layer. This currently does not persist over power loss. When you plug the keyboard back in, layer 0 will always be the default. It is theoretically possible to work around that, but that's not what `DF` does.
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+### Prevent stuck modifiers
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+
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+Consider the following scenario:
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+
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+1. Layer 0 has a key defined as Shift.
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+2. The same key is defined on layer 1 as the letter A.
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+3. User presses Shift.
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+4. User switches to layer 1 for whatever reason.
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+5. User releases Shift, or rather the letter A.
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+6. User switches back to layer 0.
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+
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+Shift was actually never released and is still considered pressed.
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+
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+If such situation bothers you add this to your `config.h`:
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+
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+ #define PREVENT_STUCK_MODIFIERS
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+
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+Warning: This option uses up 2 bytes of memory per key. For example on
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+Planck it uses 2\*4\*12=96 bytes.
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+
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### Remember: These are just aliases
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These functions work the same way that their `ACTION_*` functions do - they're just quick aliases. To dig into all of the tmk ACTION_* functions, please see the [TMK documentation](https://github.com/jackhumbert/qmk_firmware/blob/master/tmk_core/doc/keymap.md#2-action).
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