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diff --git a/riki.md b/riki.md
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--- a/riki.md
+++ b/riki.md
@@ -253,6 +253,27 @@ then AST of site/page.mdwn matches that of output/page.html
 |   1 |   2 |
 ~~~
 
+### Horizontal rule
+
+_Requirement: Markup of a horizontal rule must result in hr element in
+HTML output._
+
+~~~scenario
+given an installed riki
+given file site/page.mdwn from rule
+when I run riki site output
+then AST of site/page.mdwn matches that of output/page.html
+~~~
+
+
+~~~{#rule .file}
+foo
+
+---------------------------------------------------------------------------------------
+
+bar
+~~~
+
 ## Input files other than Markdown
 
 _Requirement: Input files that aren't Markdown files must be copied