diff --git a/docs/contributing/documentation/documentation_workflow.md b/docs/contributing/documentation/documentation_workflow.md
index 7baaedd..65cc75c 100644
--- a/docs/contributing/documentation/documentation_workflow.md
+++ b/docs/contributing/documentation/documentation_workflow.md
@@ -34,7 +34,7 @@ internal or external contributors, users or decision makers.
 
 In the context of this Documentation Hub, anything that has implication to the
 "outside". Meaning other users, operators, developers or decision makers needs
-to be documented accordingly.
+to be documented accordingly (see [ADR 0038](/reference/adr/0038-public-by-default-documentation-policy) for the full policy).
 
 This includes, but is not limited to:
 
@@ -46,7 +46,8 @@ This includes, but is not limited to:
 - Information about who is developing the project
 
 Of course this does not apply to purely internal changes like code cleanup
-contributions or similar that have no outside effect.
+contributions or similar that have no outside effect. For a precise definition
+of what qualifies as internal, see [ADR 0038](/reference/adr/0038-public-by-default-documentation-policy).
 
 ## Who Is Responsible for Maintaining Documentation?
 
@@ -143,9 +144,14 @@ The review validates:
 - **Style and Inclusivity**: Language follows the project's
   [quality criteria](./writing_good_docs.md), all images have appropriate alt
   text descriptions
-- **Maintainability**: Documentation follows single source of truth principle,
+- **Maintainability**: Documentation follows the [single source of truth](/reference/adr/0038-public-by-default-documentation-policy) principle,
   ownership is clear, no unnecessary duplication
 
+## Architecture Decisions
+
+- [ADR 0038: Public-by-Default Documentation Policy](/reference/adr/0038-public-by-default-documentation-policy)
+  — defines what must be public, what stays internal, and the delta-only model for internal supplements.
+
 ## Related Topics
 
 <RelatedTopics />
diff --git a/docs/contributing/documentation/writing_good_docs.md b/docs/contributing/documentation/writing_good_docs.md
index 1ba255b..f792258 100644
--- a/docs/contributing/documentation/writing_good_docs.md
+++ b/docs/contributing/documentation/writing_good_docs.md
@@ -168,7 +168,7 @@ Documents should:
 
 Documentation should be structured to minimize maintenance burden:
 
-- Follow the "single source of truth" principle; don't duplicate information
+- Follow the [single source of truth](/reference/adr/0038-public-by-default-documentation-policy) principle; don't duplicate information
   across multiple pages
 - Include version information where relevant
 - Clearly indicate ownership:
@@ -243,6 +243,11 @@ Use this checklist when reviewing or submitting documentation:
 - ✅ Known issues section included (if applicable)
 - ✅ External dependencies documented (if applicable)
 
+## Architecture Decisions
+
+- [ADR 0038: Public-by-Default Documentation Policy](/reference/adr/0038-public-by-default-documentation-policy)
+  — the formal policy backing the single-source-of-truth and no-duplication maintainability markers.
+
 ## Related Topics
 
 <RelatedTopics />