Wording seems a bit redundant, so I condensed this into:
Index: man/man9/module.9
===================================================================
RCS file: /cvsroot/src/share/man/man9/module.9,v
retrieving revision 1.26
diff -u -p -u -p -r1.26 module.9
--- man/man9/module.9 9 Jan 2011 05:05:10 -0000 1.26
+++ man/man9/module.9 13 Feb 2011 16:39:01 -0000
@@ -175,7 +175,8 @@ If a built-in module with that
.Fa name
is not found, the list of modules prepared by the boot loader is searched.
If the named module is still not found, an attempt is made to locate the
-module within the file system.
+module within the file system, provided it has been mounted by the
+initialization code.
.Pp
The
.Fa flags