zmk/docs/docs/behaviors/sticky-key.md

title	sidebar_label
Sticky Key Behavior	Sticky Key

Summary

A sticky key stays pressed until another key is pressed. It is often used for 'sticky shift'. By using a sticky shift, you don't have to hold the shift key to write a capital.

By default, sticky keys stay pressed for a second if you don't press any other key. You can configure this with the release-after-ms setting (see below).

Behavior Binding

• Reference: &sk
• Parameter #1: The keycode , e.g. LSHIFT

Example:

&sk LSHIFT

You can use any keycode that works for &kp as parameter to &sk:

&sk LG(LS(LA(LCTRL)))

Configuration

You can configure a different release-after-ms in your keymap:

&sk {
    release-after-ms = <2000>;
};

/ {
    keymap {
        ...
    };
};

Advanced usage

Sticky keys can be combined; if you tap &sk LCTRL and then &sk LSHIFT and then &kp A, the output will be ctrl+shift+a.

Comparison to QMK

In QMK, sticky keys are known as 'one shot mods'.