diff --git a/docs/policy/documentation.md b/docs/policy/documentation.md
index d7ab938..44c5934 100644
--- a/docs/policy/documentation.md
+++ b/docs/policy/documentation.md
@@ -161,8 +161,15 @@ Use sequentially numbered ADR filenames such as
 
 Treat the decision content of an accepted ADR as immutable. When a decision
 changes, create a new ADR and update the earlier ADR's status to superseded.
-Rejected architectural alternatives belong in the ADR; rejected product ideas
-belong in the roadmap.
+
+ADRs should be reserved for major architectural decisions, such as ownership
+boundaries, large-scale architectural features, or invariants that rise to
+the level of architectural significance. Routine choices, implementation
+decisions, and rejected suggestions do not warrant an ADR unless they
+otherwise represent a significant architectural decision.
+
+Roadmaps should preserve plausible future work, not rejected product
+ideas. 
 
 ## Maintenance