+You can use this as a template:
+```
+Copyright <year> <name> <email> @<github_username>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+```
+
+You'd want to replace the year, name, email and github username with your info.
+
+Additionally, this is a good place to document your code, if you wish to share it with others.
+
+# Examples
+
+For a brief example, checkout [`/users/_example/`](https://github.com/qmk/qmk_firmware/tree/master/users/drashna).
+For a more complicated example, checkout [`/users/drashna/`](https://github.com/qmk/qmk_firmware/tree/master/users/drashna)'s userspace.
+
+
+## Customized Functions
+
+QMK has a bunch of [functions](custom_quantum_functions.md) that have [`_quantum`, `_kb`, and `_user` versions](custom_quantum_functions.md#a-word-on-core-vs-keyboards-vs-keymap) that you can use. You will pretty much always want to use the user version of these functions. But the problem is that if you use them in your userspace, then you don't have a version that you can use in your keymap.
+
+However, you can actually add support for keymap version, so that you can use it in both your userspace and your keymap!
+
+
+For instance, let's look at the `layer_state_set_user()` function. You can enable the [Tri Layer State](ref_functions.md#olkb-tri-layers) functionality on all of your boards, while also retaining the Tri Layer functionality in your `keymap.c` files.
+
+In your `<name.c>` file, you'd want to add this:
+```c
+__attribute__ ((weak))
+uint32_t layer_state_set_keymap (uint32_t state) {
+ return state;
+}
+
+uint32_t layer_state_set_user (uint32_t state) {
+ state = update_tri_layer_state(state, 2, 3, 5);
+ return layer_state_set_keymap (state);
+}
+```
+The `__attribute__ ((weak))` part tells the compiler that this is a placeholder function that can then be replaced by a version in your `keymap.c`. That way, you don't need to add it to your `keymap.c`, but if you do, you won't get any conflicts because the function is the same name.
+
+The `_keymap` part here doesn't matter, it just needs to be something other than `_quantum`, `_kb`, or `_user`, since those are already in use. So you could use `layer_state_set_mine`, `layer_state_set_fn`, or anything else.
+
+You can see a list of this and other common functions in [`template.c`](https://github.com/qmk/qmk_firmware/blob/master/users/drashna/template.c) in [`users/drashna`](https://github.com/qmk/qmk_firmware/tree/master/users/drashna).