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+# Code review practices
+
+## Write actionable comments
+
+[Conventional comments](https://conventionalcomments.org/)
+
+### Comment structure
+
+```
+label [decorators]: subject
+
+discussion
+
+[suggestion]
+```
+
+### Tags for blocking comments
+
+- **problem**: Something is wrong with the code that means the PR should not be
+  merged.
+- **question (blocking)**: Reviewer needs an explanation about part of the code
+  before they understand it well enough to approve.
+- **cleanup**: Some vestigial code needs to be removed before merge.
+- **typo**: Fix a typo.
+
+### Non-blocking comments
+
+All non-blocking tags need to be decorated as **non-blocking** to make it clear
+to the PR author that the comment isn't blocking approval.
+
+- **quibble (non-blocking)**: Something is wrong with the code but it's not
+  severe enough to block the PR from being merged.
+- **polish (non-blocking)**: The code quality can be improved.
+- **question (non-blocking)**: Reviewer needs an explanation about part of the
+  code before they understand it well enough to approve.
+- **suggestion (non-blocking)**: A change of any kind that improves the
+  implementation or code quality, but isn't a blocking problem.