1 files changed, 7 insertions, 1 deletions
diff --git a/mdadm.8 b/mdadm.8
index 649a381..15cc178 100644
--- a/mdadm.8
+++ b/mdadm.8
@@ -1,5 +1,5 @@
 .\" -*- nroff -*-
-.TH MDADM 8 "" v2.3
+.TH MDADM 8 "" v2.3.1
 .SH NAME
 mdadm \- manage MD devices
 .I aka
@@ -249,6 +249,12 @@ The file
 .B none
 can be given when used with --grow to remove a bitmap.
 
+To help catch typing errors, the filename must contain at least one
+slash ('/') if it is a real file (not 'internal' or 'none').
+
+Note: bitmaps are only known to work on ext2 and ext3.  Using other
+filesystems may result in serious problems.
+
 .TP
 .BR --bitmap-chunk=
 Set the Chunksize of the bitmap. Each bit corresponds to that many