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-rw-r--r--g3doc/style.md9
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diff --git a/g3doc/style.md b/g3doc/style.md
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@@ -46,6 +46,15 @@ protected.
Each field or variable protected by a mutex should state as such in a comment on
the field or variable declaration.
+### Function comments
+
+Functions with special entry conditions (e.g., a lock must be held) should state
+these conditions in a `Preconditions:` comment block. One condition per line;
+multiple conditions are specified with a bullet (`*`).
+
+Functions with notable exit conditions (e.g., a `Done` function must eventually
+be called by the caller) can similarly have a `Postconditions:` block.
+
### Unused returns
Unused returns should be explicitly ignored with underscores. If there is a