Better document -B backoff-factor and when it can be used (#33, Oleksiy Zagorskyi), fixes #33

ChangeLog

@@ -4,6 +4,7 @@ UNRELEASED
   * Allow option '-f' also for non-root (since setuid privileges are dropped)
   * Remove support for NIS groups
   * Do not retry twice DNS lookup on DNS lookup problem
+  * Better document -B backoff-factor and when it can be used (#33, Oleksiy Zagorskyi)
 
 2014-03-08  David Schweikert  <david@schweikert.ch>
   * Version 3.9

doc/fping.pod

@@ -51,8 +51,8 @@ number.
 
 Backoff factor. In the default mode, B<fping> sends several requests to a
 target before giving up, waiting longer for a reply on each successive request.
-This parameter is the value by which the wait time is multiplied on each
+This parameter is the value by which the wait time (B<-t>) is multiplied on each
-successive request; it must be entered as a floating-point number (x.y).  The
+successive request; it must be entered as a floating-point number (x.y). The
 default is 1.5. 
 
 =item B<-c> I<n>
@@ -166,7 +166,9 @@ Set the interface (requires SO_BINDTODEVICE support)
 
 Initial target timeout in milliseconds (default 500). In the default mode, this
 is the amount of time that B<fping> waits for a response to its first request.
-Successive timeouts are multiplied by the backoff factor. 
+Successive timeouts are multiplied by the backoff factor specified with B<-B>.
+Note that this option has no effect looping or counting modes (B<-l>, B<-c>, or
+B<-C>).
 
 =item B<-T> I<n>