diff --git a/src/infrastructure/markup/blockrule/PhutilRemarkupInterpreterBlockRule.php b/src/infrastructure/markup/blockrule/PhutilRemarkupInterpreterBlockRule.php
--- a/src/infrastructure/markup/blockrule/PhutilRemarkupInterpreterBlockRule.php
+++ b/src/infrastructure/markup/blockrule/PhutilRemarkupInterpreterBlockRule.php
@@ -2,7 +2,7 @@
 
 final class PhutilRemarkupInterpreterBlockRule extends PhutilRemarkupBlockRule {
 
-  const START_BLOCK_PATTERN = '/^([\w]+)\s*(?:\(([^)]+)\)\s*)?{{{/';
+  const START_BLOCK_PATTERN = '/^((cowsay)|(figlet))\s*(?:\(([^)]+)\)\s*)?{{{/';
   const END_BLOCK_PATTERN   = '/}}}\s*$/';
 
   public function getMatchingLineCount(array $lines, $cursor) {