diff --git a/pages/common/php.md b/pages/common/php.md
index cadb9d4ab..9f2af8932 100644
--- a/pages/common/php.md
+++ b/pages/common/php.md
@@ -22,3 +22,7 @@
 - Start a PHP built-in web server in the current directory:
 
 `php -S {{host:port}}`
+
+- Get a list of installed PHP extensions:
+
+`php -m`