Update CONTRIBUTING.md

CONTRIBUTING.md

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 ## Pull-request tips
 
-I welcome pull requests. But accepting a PR obligates me to maintain that code for the life of Pollen. So if I seem picky about which PRs I accept — yes, because I have to be. No hard feelings.
+I welcome pull requests. But accepting a PR obligates me to maintain that code for the life of Pollen. So if I seem picky about which PRs I accept — yes, because I have to be. No hard feelings. (= Principle of Infinite Maintenance)
 
-* There’s plenty of room for improvement in the Pollen code, because every line of it has been written against the backdrop of ignorance and fallibility, mostly my own.
+* There’s plenty of room for improvement in the Pollen code, because every line of it has been written against the backdrop of ignorance and fallibility, mostly my own. (= Principle of Prior Ignorance)
 
-* I don’t necessarily prefer PRs to issues or feature requests. A good description of the problem with a working example is better than a half-baked PR. I can often fix it in less time than it would take to review the PR.
+* I don’t necessarily prefer PRs to issues or feature requests. A good description of the problem with a working example is better than a half-baked PR. I can often fix it in less time than it would take to review the PR. (= Principle of Efficiency)
 
-* If you want feedback on a potential PR, I recommend posting to the [Pollen mailing list](http://groups.google.com/forum/#!forum/pollenpub) rather than here. Because more people will see it.
+* If you want feedback on a potential PR, I recommend posting to the [Pollen mailing list](http://groups.google.com/forum/#!forum/pollenpub) rather than here. Because more people will see it. (= Principle of Exposure)
 
-* Small PRs are easier to accept than large ones. Large PRs should have a benefit worthy of their complexity.
+* Small PRs are easier to accept than large ones. Large PRs should have a benefit worthy of their complexity. PRs that want to amend Pollen’s public interface receive the highest scrutiny. (= Principle of Proportionality)
 
-* I consider every PR, but I can’t promise detailed code reviews or comments. Helpful Racketeers can be found on the [Pollen mailing list](http://groups.google.com/forum/#!forum/pollenpub), the [Racket mailing list](https://lists.racket-lang.org/), and the Racket [Slack channel](https://racket.slack.com/).
+* I consider every PR, but I can’t promise detailed code reviews or comments. Helpful Racketeers can be found on the [Pollen mailing list](http://groups.google.com/forum/#!forum/pollenpub), the [Racket mailing list](https://lists.racket-lang.org/), and the Racket [Slack channel](https://racket.slack.com/). (= Principle of Specialization)
 
-* PRs should be necessary, in the sense that the proposed change can only be accomplished by patching this repo. (Corollary:  features that can live in a separate [package](https://pkgs.racket-lang.org/) probably should.)
+* PRs should be necessary, in the sense that the proposed change can only be accomplished by patching this repo. (Corollary:  features that can live in a separate [package](https://pkgs.racket-lang.org/) probably should.) (= Principle of Necessity)
 
-* PRs should avoid introducing magic behavior (aka the [principle of least astonishment](http://wiki.c2.com/?PrincipleOfLeastAstonishment)).
+* PRs should avoid introducing magic behavior (= [Principle of Least Astonishment](http://wiki.c2.com/?PrincipleOfLeastAstonishment)).
 
-* PRs should forbid as little as possible. In particular, PRs should avoid enshrining personal preference as default behavior (because others will have different preferences).
+* PRs should forbid as little as possible. In particular, PRs should avoid enshrining personal preference as default behavior (because others will have different preferences). (= Principle of Generality)
 
-* PRs should avoid reinventing features that already exist in Racket.
+* PRs should avoid reinventing features that already exist in Racket. (= Principle of Economy)
 
-* I follow these principles too, because they’re virtuous habits. Still, I created Pollen as a tool for my writing and typography work. If a certain PR would negatively impact that work, I can’t accept it.
+* I follow these principles too, because they’re virtuous habits. Still, I created Pollen as a tool for my writing and typography work. If a certain PR would negatively impact that work, I can’t accept it. (= Principle of Royalty)
 
-* If you’re new to Pollen or Racket, your PR is more likely to be declined, because certain things you perceive as bugs are actually features, certain things you perceive as missing are actually present, and certain limitations you perceive as surmountable are actually not. (See also point #1 re: backdrop of ignorance.)
+* If you’re new to Pollen or Racket, your PR is more likely to be declined, because certain things you perceive as bugs are actually features, certain things you perceive as missing are actually present, and certain limitations you perceive as surmountable are actually not. (See also point #1 re: backdrop of ignorance.) (= Principle of Novelty)
 
-* If your PR includes open-source material from elsewhere, please make sure that material is a) compatible with the Pollen license and b) attributed in whatever way is required. Otherwise, I cannot accept it.
+* If your PR includes open-source material from elsewhere, please make sure that material is a) compatible with the Pollen license and b) attributed in whatever way is required. Otherwise, I cannot accept it. (= Principle of Legality)
 
-* PRs that could have unit tests, and don’t, will be treated harshly. As they should.
-
-* PRs that want to amend Pollen’s public interface receive the highest scrutiny.
+* PRs that could have unit tests, and don’t, will be treated harshly. As they should. (= Principle of Proof)