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diff --git a/docs/feature_layers.md b/docs/feature_layers.md
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@@ -17,6 +17,9 @@ These functions allow you to activate layers in various ways. Note that layers a
* `TO(layer)` - activates *layer* and de-activates all other layers (except your default layer). This function is special, because instead of just adding/removing one layer to your active layer stack, it will completely replace your current active layers, uniquely allowing you to replace higher layers with a lower one. This is activated on keydown (as soon as the key is pressed).
* `TT(layer)` - Layer Tap-Toggle. If you hold the key down, *layer* is activated, and then is de-activated when you let go (like `MO`). If you repeatedly tap it, the layer will be toggled on or off (like `TG`). It needs 5 taps by default, but you can change this by defining `TAPPING_TOGGLE` -- for example, `#define TAPPING_TOGGLE 2` to toggle on just two taps.
+See also the [Layer Lock key](features/layer_lock), which locks the highest
+active layer until pressed again.
+
### Caveats {#caveats}
Currently, the `layer` argument of `LT()` is limited to layers 0-15, and the `kc` argument to the [Basic Keycode set](keycodes_basic), meaning you can't use keycodes like `LCTL()`, `KC_TILD`, or anything greater than `0xFF`. This is because QMK uses 16-bit keycodes, of which 4 bits are used for the function identifier and 4 bits for the layer, leaving only 8 bits for the keycode.
@@ -74,6 +77,7 @@ There are a number of functions (and variables) related to how you can use or ma
| `default_layer_and(layer_mask)` | Turns on layers based on matching enabled bits between specifed layer and existing default layer state. |
| `default_layer_xor(layer_mask)` | Turns on layers based on non-matching bits between specifed layer and existing default layer state. |
| `default_layer_debug(layer_mask)` | Prints out the current bit mask and highest active default layer to debugger console. |
+| [`set_single_default_layer(layer)`](ref_functions.md#setting-the-persistent-default-layer) | Sets the default layer, but does _not_ write it to persistent memory (EEPROM). |
| [`set_single_persistent_default_layer(layer)`](ref_functions.md#setting-the-persistent-default-layer) | Sets the default layer and writes it to persistent memory (EEPROM). |
| [`update_tri_layer(x, y, z)`](ref_functions.md#update_tri_layerx-y-z) | Checks if layers `x` and `y` are both on, and sets `z` based on that (on if both on, otherwise off). |
| [`update_tri_layer_state(state, x, y, z)`](ref_functions.md#update_tri_layer_statestate-x-y-z) | Does the same as `update_tri_layer(x, y, z)`, but from `layer_state_set_*` functions. |