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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 7630b44e0..17be7ee6a 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
144 * `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/rules.mk` 144 * `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/rules.mk`
145 * `keyboards/top_folder/keymaps/a_keymap/rules.mk` 145 * `keyboards/top_folder/keymaps/a_keymap/rules.mk`
146 * `users/a_user_folder/rules.mk` 146 * `users/a_user_folder/rules.mk`
147 * `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/post_rules.mk`
148 * `keyboards/top_folder/sub_1/sub_2/sub_3/post_rules.mk`
149 * `keyboards/top_folder/sub_1/sub_2/post_rules.mk`
150 * `keyboards/top_folder/sub_1/post_rules.mk`
151* `keyboards/top_folder/post_rules.mk`
147* `common_features.mk` 152* `common_features.mk`
148 153
149Many of the settings written in the `rules.mk` file are interpreted by `common_features.mk`, which sets the necessary source files and compiler options. 154Many of the settings written in the `rules.mk` file are interpreted by `common_features.mk`, which sets the necessary source files and compiler options.
150 155
156The `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`.
157
158* `keyboards/top_folder/keymaps/a_keymap/rules.mk`
159 ```makefile
160 # Please set the following according to the selection of the hardware implementation option.
161 RGBLED_OPTION_TYPE = backlight ## none, backlight or underglow
162 ```
163* `keyboards/top_folder/post_rules.mk`
164 ```makefile
165 ifeq ($(filter $(strip $(RGBLED_OPTION_TYPE))x, nonex backlightx underglowx x),)
166 $(error unknown RGBLED_OPTION_TYPE value "$(RGBLED_OPTION_TYPE)")
167 endif
168
169 ifeq ($(strip $(RGBLED_OPTION_TYPE)),backlight)
170 RGBLIGHT_ENABLE = yes
171 OPT_DEFS += -DRGBLED_NUM=30
172 endif
173 ifeq ($(strip $(RGBLED_OPTION_TYPE)),underglow)
174 RGBLIGHT_ENABLE = yes
175 OPT_DEFS += -DRGBLED_NUM=6
176 endif
177 ```
178
151?> See `build_keyboard.mk` and `common_features.mk` for more details. 179?> See `build_keyboard.mk` and `common_features.mk` for more details.
152 180
153### `<keyboard_name.c>` 181### `<keyboard_name.c>`