diff --git a/doc/arm/zones.inc.rst b/doc/arm/zones.inc.rst
index 1807029cac..34afe377de 100644
--- a/doc/arm/zones.inc.rst
+++ b/doc/arm/zones.inc.rst
@@ -460,6 +460,7 @@ This example generates A and AAAA records using modifiers; the AAAA
 is equivalent to:
 
 ::
+
    HOST-0000.EXAMPLE.   A      1.2.3.1
    HOST-0001.EXAMPLE.   A      1.2.3.2
    HOST-0002.EXAMPLE.   A      1.2.3.3