decisions: clarify updates
@@ -75,6 +75,8 @@ For each solution a proposal, rationale and optionally implications should be gi
- "Decision", "Rationale" and "Implications" are now filled out and fixed according to the reviews
- decisions of this step usually already have an implementation PR
+Decisions that need an update, e.g. because assumptions changed, usually directly start with the step "Decided".
+
> In this step, decision PRs only modify a _single_ decision.
> Only exceptions like backlinks from other decisions are allowed.
