diff --git a/README.md b/README.md
index 9f17528..f7cbe9c 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,6 @@ It uses the configured `git-repository-url` as the base.
## Requirements
* The `git` command line tool.
-* A configured git repository url in your `book.toml` configuration. See [Configuration](#configuration).
* Access to the git repository checkout while building your book.
## Installation
@@ -36,10 +35,22 @@ renderer = ["html"]
```toml
[output.html]
-# Required: Your repository URL used in the link.
+# Optional: Your repository URL used in the link.
git-repository-url = "https://github.com/$user/$project"
```
+If `git-repository-url` is not configured the footer will not contain the commit and a link to it and instead only show the last changed date.
+
+Without `git-repository-url` configured:
+```HTML
+
+```
+
+With `git-repository-url` configured:
+```HTML
+
+```
+
To style the footer add a custom CSS file for your HTML output:
```toml