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+# Maintaining Tor
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+
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+This document details the duties and processes on maintaining the Tor code
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+base.
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+
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+The first section describes who is the current Tor maintainer and what are the
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+responsabilities. Tor has one main single maintainer but does have many
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+committers and subsystem maintainers.
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+
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+The second third section describes how the **alpha and master** branches are
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+maintained and by whom.
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+
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+Finally, the last section describes how the **stable** branches are maintained
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+and by whom.
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+
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+This document does not cover how Tor is released, please see
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+[ReleasingTor.md](ReleasingTor.md) for that information.
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+
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+## Tor Maintainer
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+
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+The current maintainer is Nick Mathewson <nickm@torproject.org>.
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+
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+The maintainer takes final decisions in terms of engineering, architecture and
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+protocol design. Releasing Tor falls under their responsability.
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+
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+## Alpha and Master Branches
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+
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+The Tor repository always has at all time a **master** branch which contains
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+the upstream ongoing development.
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+
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+It may also contains a branch for a released feature freezed version which is
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+called the **alpha** branch. The git tag and version number is always
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+postfixed with `-alpha[-dev]`. For example: `tor-0.3.5.0-alpha-dev` or
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+`tor-0.3.5.3-alpha`.
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+
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+Tor is separated into subsystems and some of those are maintained by other
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+developers than the main maintainer. Those people have commit access to the
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+code base but only commit (in most cases) into the subsystem they maintain.
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+
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+Upstream merges are restricted to the alpha and master branches. Subsystem
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+maintainers should never push a patch into a stable branch which is the
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+responsability of the [stable branch maintainer](#stable-branches).
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+
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+### Who
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+
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+In alphabetical order, the following people have upstream commit access and
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+maintain the following subsystems:
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+
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+- David Goulet <dgoulet@torproject.org>
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+ * Onion Service (including Shared Random).
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+ ***keywords:*** *[tor-hs]*
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+ * Channels, Circuitmux, Connection, Scheduler.
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+ ***keywords:*** *[tor-chan, tor-cmux, tor-sched, tor-conn]*
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+ * Cell Logic (Handling/Parsing).
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+ ***keywords:*** *[tor-cell]*
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+ * Threading backend.
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+ ***keywords:*** *[tor-thread]*
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+
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+- George Kadianakis <asn@torproject.org>
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+ * Onion Service (including Shared Random).
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+ ***keywords:*** *[tor-hs]*
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+ * Guard.
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+ ***keywords:*** *[tor-guard]*
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+ * Pluggable Transport (excluding Bridge networking).
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+ ***keywords:*** *[tor-pt]*
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+
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+### Tasks
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+
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+These are the tasks of a subsystem maintainer:
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+
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+1. Regurlarly go over `merge_ready` tickets relevant to the related subsystem
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+ and for the current alpha or development (master branch) Milestone.
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+
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+2. A subsystem maintainer is expected to contribute to any design changes
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+ (including proposals) or large patch set about the subsystem.
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+
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+3. Leave their ego at the door. Mistakes will be made but they have to be
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+ taking care of seriously. Learn and move on quickly.
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+
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+### Merging Policy
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+
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+These are few important items to follow when merging code upstream:
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+
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+1. To merge code upstream, the patch must have passed our CI (currently
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+ github.com/torproject), have a corresponding ticket and reviewed by
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+ **at least** one person that is not the original coder.
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+
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+ Example A: If Alice writes a patch then Bob, a Tor network team member,
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+ reviews it and flags it `merge_ready`. Then, the maintainter is required
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+ to look at the patch and makes a decision.
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+
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+ Example B: If the maintainer writes a patch then Bob, a Tor network
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+ team member, reviews it and flags it `merge_ready`, then the maintainer
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+ can merge the code upstream.
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+
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+2. Maintainer makes sure the commit message should describe what was fixed
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+ and, if it applies, how was it fixed. It should also always refer to
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+ the ticket number.
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+
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+3. Trivial patches such as comment change, documentation, syntax issues or
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+ typos can be merged without a ticket or reviewers.
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+
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+4. Tor uses the "merge forward" method that is if a patch applies to the
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+ alpha branch, it has to be merged there first and then merged forward
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+ into master.
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+
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+5. Maintainer should always consult with the network team about any doubts,
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+ mis-understandings or unknowns of a patch. Final word will always go to the
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+ main Tor maintainer.
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+
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+## Stable Branches
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+
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+(Currently being drafted and reviewed by the network team.)
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