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-rw-r--r--docs/hardware_keyboard_guidelines.md28
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diff --git a/docs/hardware_keyboard_guidelines.md b/docs/hardware_keyboard_guidelines.md
index 7630b44e0c..17be7ee6aa 100644
--- a/docs/hardware_keyboard_guidelines.md
+++ b/docs/hardware_keyboard_guidelines.md
@@ -144,10 +144,38 @@ The `rules.mk` file can also be placed in a sub-folder, and its reading order is
* `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/rules.mk`
* `keyboards/top_folder/keymaps/a_keymap/rules.mk`
* `users/a_user_folder/rules.mk`
+ * `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/post_rules.mk`
+ * `keyboards/top_folder/sub_1/sub_2/sub_3/post_rules.mk`
+ * `keyboards/top_folder/sub_1/sub_2/post_rules.mk`
+ * `keyboards/top_folder/sub_1/post_rules.mk`
+* `keyboards/top_folder/post_rules.mk`
* `common_features.mk`
Many of the settings written in the `rules.mk` file are interpreted by `common_features.mk`, which sets the necessary source files and compiler options.
+The `post_rules.mk` file can interpret `features` of a keyboard-level before `common_features.mk`. For example, when your designed keyboard has the option to implement backlighting or underglow using rgblight.c, writing the following in the `post_rules.mk` makes it easier for the user to configure the `rules.mk`.
+
+* `keyboards/top_folder/keymaps/a_keymap/rules.mk`
+ ```makefile
+ # Please set the following according to the selection of the hardware implementation option.
+ RGBLED_OPTION_TYPE = backlight ## none, backlight or underglow
+ ```
+* `keyboards/top_folder/post_rules.mk`
+ ```makefile
+ ifeq ($(filter $(strip $(RGBLED_OPTION_TYPE))x, nonex backlightx underglowx x),)
+ $(error unknown RGBLED_OPTION_TYPE value "$(RGBLED_OPTION_TYPE)")
+ endif
+
+ ifeq ($(strip $(RGBLED_OPTION_TYPE)),backlight)
+ RGBLIGHT_ENABLE = yes
+ OPT_DEFS += -DRGBLED_NUM=30
+ endif
+ ifeq ($(strip $(RGBLED_OPTION_TYPE)),underglow)
+ RGBLIGHT_ENABLE = yes
+ OPT_DEFS += -DRGBLED_NUM=6
+ endif
+ ```
+
?> See `build_keyboard.mk` and `common_features.mk` for more details.
### `<keyboard_name.c>`