[Code] Add solid reactive gradient mode (#17228)

1 files changed, 10 insertions, 0 deletions

diff --git a/docs/feature_rgb_matrix.md b/docs/feature_rgb_matrix.md
index 2debfd1c2f..f9ab395488 100644
--- a/docs/feature_rgb_matrix.md
+++ b/docs/feature_rgb_matrix.md
@@ -688,6 +688,16 @@ Remove the spread effect entirely.
 #define RGB_MATRIX_TYPING_HEATMAP_SLIM
 ```
 
+### RGB Matrix Effect Solid Reactive :id=rgb-matrix-effect-solid-reactive
+
+Solid reactive effects will pulse RGB light on key presses with user configurable hues. To enable gradient mode that will automatically change reactive color, add the following define:
+
+```c
+#define RGB_MATRIX_SOLID_REACTIVE_GRADIENT_MODE
+```
+
+Gradient mode will loop through the color wheel hues over time and its duration can be controlled with the effect speed keycodes (`RGB_SPI`/`RGB_SPD`).
+
 ## Custom RGB Matrix Effects :id=custom-rgb-matrix-effects
 
 By setting `RGB_MATRIX_CUSTOM_USER = yes` in `rules.mk`, new effects can be defined directly from your keymap or userspace, without having to edit any QMK core files. To declare new effects, create a `rgb_matrix_user.inc` file in the user keymap directory or userspace folder.