Add BACKWARD COMPATIBILITY for more post-1.0 APIs.
[skip ci]
diff --git a/pcap_datalink_val_to_name.3pcap b/pcap_datalink_val_to_name.3pcap
index 119e8b0..bbfa3f8 100644
--- a/pcap_datalink_val_to_name.3pcap
+++ b/pcap_datalink_val_to_name.3pcap
@@ -63,5 +63,14 @@
.B DLT_
value, the string "DLT n" is returned, where n is the value of
the dlt argument.
+.SH BACKWARD COMPATIBILITY
+The
+.BR pcap_datalink_val_to_description_or_dlt ()
+function first became available in libpcap release 1.10.0. In previous
+releases,
+.BR pcap_datalink_val_to_description ()
+would have to be called and, if it returned
+.BR NULL ,
+a default string would have to be constructed.
.SH SEE ALSO
.BR pcap (3PCAP)
diff --git a/pcap_dump_ftell.3pcap b/pcap_dump_ftell.3pcap
index 58df7a4..062d609 100644
--- a/pcap_dump_ftell.3pcap
+++ b/pcap_dump_ftell.3pcap
@@ -54,5 +54,11 @@
are supported, this will return the file offset without truncation.
.B PCAP_ERROR
is returned on error.
+.SH BACKWARD COMPATIBILITY
+The function
+.BR pcap_dump_ftell64 ()
+became available in libpcap release 1.9.0. In previous releases, there
+was no mechanism to obtain a file offset that is too large to fit in a
+.BR long .
.SH SEE ALSO
.BR pcap (3PCAP)
diff --git a/pcap_get_required_select_timeout.3pcap b/pcap_get_required_select_timeout.3pcap
index e70bc02..0256a6a 100644
--- a/pcap_get_required_select_timeout.3pcap
+++ b/pcap_get_required_select_timeout.3pcap
@@ -160,6 +160,16 @@
or
.BR kevent ()
even if the code must also work with libpcap 1.9.x.
+.SH BACKWARD COMPATIBILITY
+This function became available in libpcap release 1.9.0. In previous
+releases,
+.BR select (),
+.BR poll (),
+.BR epoll_wait (),
+and
+.BR kevent ()
+could not be used for devices that don't provide a selectable file
+descriptor.
.SH SEE ALSO
.BR pcap (3PCAP),
.BR pcap_get_selectable_fd (3PCAP),
diff --git a/pcap_init.3pcap b/pcap_init.3pcap
index ba34cc4..543f083 100644
--- a/pcap_init.3pcap
+++ b/pcap_init.3pcap
@@ -91,5 +91,9 @@
is assumed to be able to hold at least
.B PCAP_ERRBUF_SIZE
chars.
+.SH BACKWARD COMPATIBILITY
+This function became available in libpcap release 1.10.0. In previous
+releases, on Windows, all strings supplied as arguments, and all strings
+returned to the caller, are in the local character encoding.
.SH SEE ALSO
.BR pcap (3PCAP)
diff --git a/pcap_open_dead.3pcap.in b/pcap_open_dead.3pcap.in
index e28d5bd..ced7d6c 100644
--- a/pcap_open_dead.3pcap.in
+++ b/pcap_open_dead.3pcap.in
@@ -74,6 +74,12 @@
should be specified if the packets to be written have time stamps in
seconds and nanoseconds. Its value does not affect
.BR pcap_compile (3PCAP).
+.SH BACKWARD COMPATIBILITY
+The
+.BR pcap_open_dead_with_tstamp_precision ()
+function became available in libpcap release 1.5.1. In previous
+releases, there was no mechanism to open a savefile for writing with
+time stamps given in seconds and nanoseconds.
.SH SEE ALSO
.BR pcap (3PCAP),
.BR \%pcap-linktype (@MAN_MISC_INFO@)
