wipefs: add note about no-act to the man page

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/misc-utils/wipefs.8 b/misc-utils/wipefs.8
index 666c03c93de45bb60043cbee2e91d9490814b3ad..b7c7467feb585bf98b02011372fc0cd9658b949c 100644 (file)
--- a/misc-utils/wipefs.8
+++ b/misc-utils/wipefs.8
@@ -32,10 +32,14 @@ the device.  The
 command lists only the first offset where a magic string has been detected.  The device
 is not scanned for additional magic strings for the same filesystem.  It is possible
 that after a \fBwipefs -o \fIoffset\fR the same filesystem or partition
-table will still be visible because of another magic string on another offset.
+table will still be visible because of another magic string on another offset. The
+option \fB\-\-no\-act\fR is also affected by this behavior and only the first
+magic string for the filesystem is reported.
 
 When option \fB-a\fR is used, all magic strings that are visible for libblkid are
-erased.
+erased. In this case the
+.B wipefs
+scans the device again after each modification (erase) until no magic string is found.
 
 Note that by default
 .B wipefs