diff --git a/docs/misc/hypfs-paths.pandoc b/docs/misc/hypfs-paths.pandoc
index dddb592bc5..6c7b2f7ee3 100644
--- a/docs/misc/hypfs-paths.pandoc
+++ b/docs/misc/hypfs-paths.pandoc
@@ -179,7 +179,7 @@ The minor version of Xen.
 
 A directory of runtime parameters.
 
-#### /params/*
+#### /params/* [w]
 
 The individual parameters. The description of the different parameters can be
 found in `docs/misc/xen-command-line.pandoc`.