2 files changed, 22 insertions, 3 deletions

diff --git a/docs/config_options.md b/docs/config_options.md
index 63bcc41d0..f5c2e76e7 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -143,7 +143,7 @@ If you define these options you will enable the associated feature, which may in
   * Breaks any Tap Toggle functionality (`TT` or the One Shot Tap Toggle)
 * `#define LEADER_TIMEOUT 300`
   * how long before the leader key times out
-    * If you're having issues finishing the sequence before it times out, you may need to increase the timeout setting. Or you may want to enable the `LEADER_PER_KEY_TIMING` option, which resets the timeout after each key is tapped. 
+    * If you're having issues finishing the sequence before it times out, you may need to increase the timeout setting. Or you may want to enable the `LEADER_PER_KEY_TIMING` option, which resets the timeout after each key is tapped.
 * `#define LEADER_PER_KEY_TIMING`
   * sets the timer for leader key chords to run on each key press rather than overall
 * `#define LEADER_KEY_STRICT_KEY_PROCESSING`
@@ -197,6 +197,9 @@ If you define these options you will enable the associated feature, which may in
 
 Split Keyboard specific options, make sure you have 'SPLIT_KEYBOARD = yes' in your rules.mk
 
+* `SPLIT_TRANSPORT = custom`
+  * Allows replacing the standard split communication routines with a custom one. ARM based split keyboards must use this at present.
+
 ### Setting Handedness
 
 One thing to remember, the side that the USB port is plugged into is always the master half. The side not plugged into USB is the slave.
@@ -208,7 +211,7 @@ There are a few different ways to set handedness for split keyboards (listed in
 3. Set `MASTER_RIGHT`: Half that is plugged into the USB port is determined to be the master and right half (inverse of the default)
 4. Default: The side that is plugged into the USB port is the master half and is assumed to be the left half. The slave side is the right half
 
-* `#define SPLIT_HAND_PIN B7` 
+* `#define SPLIT_HAND_PIN B7`
   * For using high/low pin to determine handedness, low = right hand, high = left hand. Replace `B7` with the pin you are using. This is optional, and if you leave `SPLIT_HAND_PIN` undefined, then you can still use the EE_HANDS method or MASTER_LEFT / MASTER_RIGHT defines like the stock Let's Split uses.
 
 * `#define EE_HANDS` (only works if `SPLIT_HAND_PIN` is not defined)
@@ -302,6 +305,10 @@ Use these to enable or disable building certain features. The more you have enab
   * Current options are AdafruitEzKey, AdafruitBLE, RN42
 * `SPLIT_KEYBOARD`
   * Enables split keyboard support (dual MCU like the let's split and bakingpy's boards) and includes all necessary files located at quantum/split_common
+* `CUSTOM_MATRIX`
+  * Allows replacing the standard matrix scanning routine with a custom one.
+* `CUSTOM_DEBOUNCE`
+  * Allows replacing the standard key debouncing routine with a custom one.
 * `WAIT_FOR_USB`
   * Forces the keyboard to wait for a USB connection to be established before it starts up
 * `NO_USB_STARTUP_CHECK`
diff --git a/docs/getting_started_make_guide.md b/docs/getting_started_make_guide.md
index adc1aed75..bb7e1e7e3 100644
--- a/docs/getting_started_make_guide.md
+++ b/docs/getting_started_make_guide.md
@@ -97,7 +97,7 @@ This allows you to send Unicode characters using `UC(<code point>)` in your keym
 
 `UNICODEMAP_ENABLE`
 
-This allows you to send Unicode characters using `X(<map index>)` in your keymap. You will need to maintain a mapping table in your keymap file. All possible code points (up to `0x10FFFF`) are supported. 
+This allows you to send Unicode characters using `X(<map index>)` in your keymap. You will need to maintain a mapping table in your keymap file. All possible code points (up to `0x10FFFF`) are supported.
 
 `UCIS_ENABLE`
 
@@ -135,6 +135,18 @@ This enables [key lock](feature_key_lock.md). This consumes an additional 260 by
 
 This enables split keyboard support (dual MCU like the let's split and bakingpy's boards) and includes all necessary files located at quantum/split_common
 
+`SPLIT_TRANSPORT`
+
+As there is no standard split communication driver for ARM-based split keyboards yet, `SPLIT_TRANSPORT = custom` must be used for these. It will prevent the standard split keyboard communication code (which is AVR-specific) from being included, allowing a custom implementation to be used.
+
+`CUSTOM_MATRIX`
+
+Lets you replace the default matrix scanning routine with your own code. You will need to provide your own implementations of matrix_init() and matrix_scan().
+
+`CUSTOM_DEBOUNCE`
+
+Lets you replace the default key debouncing routine with your own code. You will need to provide your own implementation of debounce().
+
 ## Customizing Makefile Options on a Per-Keymap Basis
 
 If your keymap directory has a file called `rules.mk` any options you set in that file will take precedence over other `rules.mk` options for your particular keyboard.