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-rw-r--r--doc/dumpcap.pod11
1 files changed, 7 insertions, 4 deletions
diff --git a/doc/dumpcap.pod b/doc/dumpcap.pod
index 5753f99075..1c76aa8fc2 100644
--- a/doc/dumpcap.pod
+++ b/doc/dumpcap.pod
@@ -98,6 +98,9 @@ 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.
@@ -105,10 +108,10 @@ 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.