diff --git a/Additional-Configuration.md b/Additional-Configuration.md
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-### Systemd Service
-
-You can follow the steps below to run Mango as a systemd service
-
-1. Make sure you have the mango binary installed at `/usr/local/bin/mango`.
-2. Create a file named `mango.service` at `/etc/systemd/user` with the following content
-
-```systemd
-[Unit]
-Description=Mango manga server
-After=network.target
-
-[Service]
-Type=simple
-Restart=always
-RestartSec=1
-ExecStart=/usr/local/bin/mango
-
-[Install]
-WantedBy=default.target
-```
-
-3. Enable the service by running `systemctl --user enable mango.service`.
-4. Now you can start Mango using `systemctl --user start mango`.
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diff --git a/Additional-Configurations.md b/Additional-Configurations.md
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+### Systemd Service
+
+You can follow the steps below to run Mango as a systemd service
+
+1. Make sure you have the mango binary installed at `/usr/local/bin/mango`.
+2. Create a file named `mango.service` at `/etc/systemd/user` with the following content
+
+```systemd
+[Unit]
+Description=Mango manga server
+After=network.target
+
+[Service]
+Type=simple
+Restart=always
+RestartSec=1
+ExecStart=/usr/local/bin/mango
+
+[Install]
+WantedBy=default.target
+```
+
+3. Enable the service by running `systemctl --user enable mango.service`.
+4. Now you can start Mango using `systemctl --user start mango`.
+
+### MangaDex Rename Rules
+
+You can customize the naming rules of manga and chapters downloaded from MangaDex using the `chapter_rename_rule` and `manga_rename_rule` fields in the `mangadex` config section.
+
+#### Terminologies
+
+**Variables**: keywords that can be used in the renaming rules.
+
+Available variables for manga:
+
+| Variable | Example |
+| --- | --- |
+| id | 7139 |
+| title | One Punch-Man |
+| author | ONE |
+| artist | Murata Yuusuke |
+
+Available variables for chapters:
+
+| Variable | Example | Optional |
+| --- | --- | --- |
+| id | 867036 | No |
+| title | Won't Lose | Yes |
+| volume | 2 | Yes |
+| chapter | 131 | Yes |
+| lang_code | en | No |
+| language | English | No |
+| pages | 25 | No |
+| groups | r/OnePunchMan | No |
+
+**Patterns**: Variables can only be used in a pattern with the `{variable}` syntax. Using the above example, `{title}` will be expanded to `Won't Lose`. If the captured variable is optional and is empty, the pattern will be expanded to an empty string.
+
+You can include multiple variables in a single pattern and separate them with `|`. Mango will first attempt to expand the pattern using the first variable. If it's empty, Mango would attempt to use the second variable, and so on. If all the variables are empty, the pattern will be expanded to en empty string. Using the above example, `{title | id}` will be expanded to `Won't Lose` because the `title` field is not empty. If it's empty, the pattern will be expanded to `867036`.
+
+**Groups**: Patterns and regular strings can be grouped into a group using the `[]` syntax. If any included pattern is empty, the whole group will be expanded to an empty string.
+
+For example, the group `[Ch.{chapter}]` will be expanded to `Ch.131` if `chapter` is `131`. If `chapter` is empty, the group will be expanded to an empty string.
+
+**Rename Rule**: A rename rule is built with any number of groups, patterns, and regular strings. To illustrate, let's take a look at the default rename rule for MangaDex chapters:
+
+```
+[Vol.{volume} ][Ch.{chapter} ]{title|id}
+```
+
+If `volume`, `chapter`, and `title` are all non-empty, it will be expanded to something like `Vol.2 Ch.131 Won't Lose`, and the chapter will be downloaded as a file named `Vol.2 Ch.131 Won't Lose.cbz`. If `volume` is empty, the rule will be expanded to `Ch.131 Won't Lose`.
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