diff --git a/mkdocs.yml b/mkdocs.yml
index 7b0faa9570..1a9bdf2261 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -19,8 +19,17 @@ extra_css:
 markdown_extensions:
 - codehilite:
     guess_lang: false
-draft_docs: |  # for preview with `mkdocs serve`, but excluded from `mkdocs build`
-  /conformance.md
+strict: true
+validation:
+  nav:
+    omitted_files: warn
+    not_found: warn
+    absolute_links: warn
+  links:
+    not_found: warn
+    anchors: warn
+    absolute_links: warn
+    unrecognized_links: warn
 nav:
 - 'Copyright': index.md
 - 'Introduction': introduction.md
@@ -45,3 +54,6 @@ nav:
 - licenses:
   - 'Creative Commons Attribution License 3.0 Unported': licenses/CC-BY-3.0.md
   - 'Community Specification License 1.0': licenses/Community-Spec-1.0.md
+draft_docs: |  # for preview with `mkdocs serve`, but excluded from `mkdocs build`
+  ISO_foreword.md
+  conformance.md