Shows how to reference a line within a repository file.

doc/user/markdown.md

@@ -238,7 +238,7 @@ GFM will turn that reference into a link so you can navigate between them easily
 GFM will recognize the following:
 | input                      | references                      |
-|:-----------------------|:---------------------------  |
+|:---------------------------|:--------------------------------|
 | `@user_name`               | specific user                   |
 | `@group_name`              | specific group                  |
 | `@all`                     | entire team                     |
@@ -254,6 +254,7 @@ GFM will recognize the following:
 | `9ba12248`                 | specific commit                 |
 | `9ba12248...b19a04f5`      | commit range comparison         |
 | `[README](doc/README)`     | repository file references      |
+| `[README](doc/README#L13)` | repository file line references |
 GFM also recognizes certain cross-project references: