Index: sbin/fsck/fsck.8
===================================================================
--- sbin/fsck/fsck.8
+++ sbin/fsck/fsck.8
@@ -142,8 +142,12 @@
 .Nm
 is compiled to support it.
 .It Fl f
-Force checking of file systems, even when they are marked clean (for file systems
-that support this).
+Force checking of file systems.
+Running 
+.Nm
+-f ignores the journal and does a full
+consistency check of the disk so will find and fix the errors about which the
+journal is unaware.
 .It Fl n
 Causes
 .Nm