diff --git a/src/transform/apply-gen.xsl b/src/transform/apply-gen.xsl
index a4c19df..64af923 100644
--- a/src/transform/apply-gen.xsl
+++ b/src/transform/apply-gen.xsl
@@ -45,6 +45,11 @@
 <template match="/xsl:stylesheet|/xsl:transform"
           priority="5">
   <document>
+    <comment>
+      <text>WARNING: This stylesheet has been generated by </text>
+      <text>hoxsl; please do not modify</text>
+    </comment>
+
     <out:stylesheet version="2.0">
       <xsl:apply-templates mode="fgen:create" />
     </out:stylesheet>