1 files changed, 21 insertions, 10 deletions

diff --git a/docs/feature_led_matrix.md b/docs/feature_led_matrix.md
index 7834b940d..e56caabfe 100644
--- a/docs/feature_led_matrix.md
+++ b/docs/feature_led_matrix.md
@@ -15,7 +15,20 @@ LED_MATRIX_ENABLE = yes
 LED_MATRIX_DRIVER = IS31FL3731
 ```
 
-Configure the hardware via your `config.h`:
+You can use between 1 and 4 IS31FL3731 IC's. Do not specify `LED_DRIVER_ADDR_<N>` defines for IC's that are not present on your keyboard. You can define the following items in `config.h`:
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| `ISSI_TIMEOUT` | (Optional) How long to wait for i2c messages, in milliseconds | 100 |
+| `ISSI_PERSISTENCE` | (Optional) Retry failed messages this many times | 0 |
+| `LED_DRIVER_COUNT` | (Required) How many LED driver IC's are present | |
+| `DRIVER_LED_TOTAL` | (Required) How many LED lights are present across all drivers | |
+| `LED_DRIVER_ADDR_1` | (Required) Address for the first LED driver | |
+| `LED_DRIVER_ADDR_2` | (Optional) Address for the second LED driver | |
+| `LED_DRIVER_ADDR_3` | (Optional) Address for the third LED driver | |
+| `LED_DRIVER_ADDR_4` | (Optional) Address for the fourth LED driver | |
+
+Here is an example using 2 drivers.
 
 ```c
 // This is a 7-bit address, that gets left-shifted and bit 0
@@ -25,18 +38,16 @@ Configure the hardware via your `config.h`:
 // 0b1110111 AD <-> VCC
 // 0b1110101 AD <-> SCL
 // 0b1110110 AD <-> SDA
-#define DRIVER_ADDR_1 0b1110100
-#define DRIVER_ADDR_2 0b1110110
+#define LED_DRIVER_ADDR_1 0b1110100
+#define LED_DRIVER_ADDR_2 0b1110110
 
-#define DRIVER_COUNT 2
-#define DRIVER_1_LED_TOTAL 25
-#define DRIVER_2_LED_TOTAL 24
-#define DRIVER_LED_TOTAL (DRIVER_1_LED_TOTAL + DRIVER_2_LED_TOTAL)
+#define LED_DRIVER_COUNT 2
+#define LED_DRIVER_1_LED_TOTAL 25
+#define LED_DRIVER_2_LED_TOTAL 24
+#define DRIVER_LED_TOTAL (LED_DRIVER_1_LED_TOTAL + LED_DRIVER_2_LED_TOTAL)
 ```
 
-!> Note the parentheses, this is so when `DRIVER_LED_TOTAL` is used in code and expanded, the values are added together before any additional math is applied to them. As an example, `rand() % (DRIVER_1_LED_TOTAL + DRIVER_2_LED_TOTAL)` will give very different results than `rand() % DRIVER_1_LED_TOTAL + DRIVER_2_LED_TOTAL`.
-
-Currently only 2 drivers are supported, but it would be trivial to support all 4 combinations.
+!> Note the parentheses, this is so when `LED_DRIVER_LED_TOTAL` is used in code and expanded, the values are added together before any additional math is applied to them. As an example, `rand() % (LED_DRIVER_1_LED_TOTAL + LED_DRIVER_2_LED_TOTAL)` will give very different results than `rand() % LED_DRIVER_1_LED_TOTAL + LED_DRIVER_2_LED_TOTAL`.
 
 Define these arrays listing all the LEDs in your `<keyboard>.c`: