+load_log($package, $hashref)
+ Loads the log file for the given package and returns a list of
+ logged commands.
+ (Passing a hashref also causes it to populate the hash.)
+write_log($cmd, $package ...)
+ Writes the log files for the specified package(s), adding
+ the cmd to the end.
+
+Sequence Addons:
+---------------
+
+The dh(1) command has a --with <addon> parameter that ca be used to load
+a sequence addon module named Debian::Debhelper::Sequence::<addon>.
+These modules can add/remove commands to the dh command sequences, by
+calling some functions from Dh_Lib:
+
+insert_before($existing_command, $new_command)
+ Insert $new_command in sequences before $existing_command
+
+insert_after($existing_command, $new_command)
+ Insert $new_command in sequences after $existing_command
+
+remove_command($existing_command)
+ Remove $existing_command from the list of commands to run
+ in all sequences.
+
+add_command($new_command, $sequence)
+ Add $new_command to the beginning of the specified sequence.
+ If the sequence does not exist, it will be created.
+
+add_command_options($command, $opt1, $opt2, ...)
+ Append $opt1, $opt2 etc. to the list of additional options which
+ dh passes when running the specified $command. These options are
+ not relayed to debhelper commands called via $command override.
+
+remove_command_options($command)
+ Clear all additional $command options previously added with
+ add_command_options().
+
+remove_command_options($command, $opt1, $opt2, ...)
+ Remove $opt1, $opt2 etc. from the list of additional options which
+ dh passes when running the specified $command.
+
+Buildsystem Classes:
+-------------------
+
+The dh_auto_* commands are frontends that use debhelper buildsystem
+classes. These classes have names like Debian::Debhelper::Buildsystem::foo,
+and are derived from Debian::Debhelper::Buildsystem, or other, related
+classes.
+
+A buildsystem class needs to inherit or define these methods: DESCRIPTION,
+check_auto_buildable, configure, build, test, install, clean. See the comments
+inside Debian::Debhelper::Buildsystem for details. Note that this interface
+is still subject to change.
+
+Note that third-party buildsystems will not automatically be used by default,
+but can be forced to be used via the --buildsystem parameter.