diff --git a/src/docs/markdown/caddyfile/directives/map.md b/src/docs/markdown/caddyfile/directives/map.md
index 11481e7..0e9717f 100644
--- a/src/docs/markdown/caddyfile/directives/map.md
+++ b/src/docs/markdown/caddyfile/directives/map.md
@@ -20,9 +20,19 @@ map [<matcher>] <source> <destinations...> {
 ```
 
 - **&lt;source&gt;** is the input value to switch on. Usually a placeholder.
+
 - **&lt;destinations...&gt;** are the placeholders to create that hold the output values.
-- **&lt;input&gt;** is the input value to match. If prefixed with `~`, is treated as a regular expression.
-- **&lt;outputs...&gt;** is one or more output values to store in the associated placeholder. The first output is written to the first destination, the second output to the second destination, etc. As a special case, the Caddyfile parser treats outputs that are a literal hyphen (`-`) as null/nil values. This is useful if you want to fall back to a default value for that particular output in the case of the given input, but want to use non-default values for other outputs. The number of outputs for each mapping must not exceed the number of destinations; however, for convenience, there may be fewer outputs than destinations, and any missing outputs will be filled in implicitly.
+
+- **&lt;input&gt;** is the input value to match. If prefixed with `~`, it is treated as a regular expression.
+
+- **&lt;outputs...&gt;** is one or more output values to store in the associated placeholder. The first output is written to the first destination, the second output to the second destination, etc.
+  
+  As a special case, the Caddyfile parser treats outputs that are a literal hyphen (`-`) as null/nil values. This is useful if you want to fall back to a default value for that particular output in the case of the given input, but want to use non-default values for other outputs.
+
+  The number of outputs for each mapping must not exceed the number of destinations; however, for convenience, there may be fewer outputs than destinations, and any missing outputs will be filled in implicitly.
+  
+  If a regular expression was used as the input, then the capture groups can be referenced with `${capture_group}` where `capture_group` is either the name or number of the capture group in the expression. Capture group `0` is the full regexp match, `1` is the first capture group, `2` is the second capture group, and so on.
+
 - **&lt;default&gt;** specifies the output values to store if no inputs are matched.
 
 
@@ -31,20 +41,22 @@ map [<matcher>] <source> <destinations...> {
 The following example demonstrates most aspects of this directive:
 
 ```caddy-d
-map {host}           {my_placeholder}  {magic_number} {
-	example.com      "some value"      3
-	foo.example.com  "another value"
+map {host}             {my_placeholder}  {magic_number} {
+	example.com        "some value"      3
+	foo.example.com    "another value"
+	(.*)\.example.com  "${1} subdomain"  5
 
-	~.*\.net$        -                 7
-	~.*\.xyz$        -                 15
+	~.*\.net$          -                 7
+	~.*\.xyz$          -                 15
 
-	default          "unknown domain"  42
+	default            "unknown domain"  42
 }
 ```
 
 This directive switches on the value of `{host}`, i.e. the domain name of the request.
 
-If the request is for `example.com`, set `{my_placeholder}` to `some value`, and `{magic_number}` to `3`.
-Else, if the request is for `foo.example.com`, set `{my_placeholder}` to `another value`, and let `{magic_number}` default to `42`.
-Else, if the request is for any host that ends in `.net` or `.xyz`, set only `{magic_number}` to `7` or `15`, respectively. Leave `{my_placeholder}` unset.
-Else (for all other hosts), the default values will apply: `{my_placeholder}` will be set to `unknown domain` and `{magic_number}` will be set to `42`.
+- If the request is for `example.com`, set `{my_placeholder}` to `some value`, and `{magic_number}` to `3`.
+- Else, if the request is for `foo.example.com`, set `{my_placeholder}` to `another value`, and let `{magic_number}` default to `42`.
+- Else, if the request is for any subdomain of `example.com`, set `{my_placeholder}` to a string containing the value of the first regexp capture group, i.e the entire subdomain, and set `{magic_number}` to 5.
+- Else, if the request is for any host that ends in `.net` or `.xyz`, set only `{magic_number}` to `7` or `15`, respectively. Leave `{my_placeholder}` unset.
+- Else (for all other hosts), the default values will apply: `{my_placeholder}` will be set to `unknown domain` and `{magic_number}` will be set to `42`.