1 files changed, 7 insertions, 4 deletions
diff --git a/doc/tshark.pod b/doc/tshark.pod
index 9cde4e4fea..664851bafe 100644
--- a/doc/tshark.pod
+++ b/doc/tshark.pod
@@ -209,6 +209,9 @@ where I<key> is one of:
 B<duration>:I<value> switch to the next file after I<value> seconds have
 elapsed, even if the current file is not completely filled up.
 
+B<interval>:I<value> switch to the next file when the time is an exact
+multiple of I<value> seconds
+
 B<filesize>:I<value> switch to the next file after it reaches a size of
 I<value> kB.  Note that the filesize is limited to a maximum value of 2 GiB.
 
@@ -216,10 +219,10 @@ B<files>:I<value> begin again with the first file after I<value> number of
 files were written (form a ring buffer).  This value must be less than 100000.
 Caution should be used when using large numbers of files: some filesystems do
 not handle many files in a single directory well.  The B<files> criterion
-requires either B<duration> or B<filesize> to be specified to control when to
-go to the next file.  It should be noted that each B<-b> parameter takes exactly
-one criterion; to specify two criterion, each must be preceded by the B<-b>
-option.
+requires either B<duration>, B<interval> or B<filesize> to be specified to
+control when to go to the next file.  It should be noted that each B<-b>
+parameter takes exactly one criterion; to specify two criterion, each must be
+preceded by the B<-b> option.
 
 Example: B<-b filesize:1000 -b files:5> results in a ring buffer of five files
 of size one megabyte each.