diff --git a/Jenkinsfile b/Jenkinsfile
index 865ecfa..e6aef2d 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -78,11 +78,11 @@ pipeline {
               for (entry in cs.items) changed.addAll(entry.affectedPaths)
             }
             // Only client-facing changes rebuild (and so republish) a
-            // platform; Markdown doesn't count. The job's Git path filter
+            // platform; Markdown (.md, .markdown) doesn't count. The job's Git path filter
             // uses the same paths, so other pushes don't start a run at all.
             // A CI-only change (Jenkinsfile, ci/) takes a manual run.
             def touches = { prefixes ->
-              changed.any { p -> !p.toLowerCase().endsWith('.md') && prefixes.any { p.startsWith(it) } }
+              changed.any { p -> !(p.toLowerCase() ==~ /.*\.(md|markdown)/) && prefixes.any { p.startsWith(it) } }
             }
             buildPc = touches(['DorkNet.ClientMod/', 'tools/build_pc.py'])
             buildQuest = touches(['DorkNet.Quest/'])
diff --git a/ci/jenkins/README.md b/ci/jenkins/README.md
index 98dcd39..53f2754 100644
--- a/ci/jenkins/README.md
+++ b/ci/jenkins/README.md
@@ -64,14 +64,14 @@ Resolve a table for another build locally with `build.py build --dump-cs`.
   changes, and only the platform they touch:
   - `DorkNet.ClientMod/` and `tools/build_pc.py` rebuild PC;
   - `DorkNet.Quest/` rebuilds Quest;
-  - Markdown files never count; server, docs and CI-only pushes (including
+  - Markdown files (`.md`, `.markdown`) never count; server, docs and CI-only pushes (including
     the `Jenkinsfile` and `ci/`) build nothing. Run those manually.
 
   Set the same filter on the job so other pushes don't start a run at all:
   under the job's **Git** source, add **Additional Behaviours → Polling
   ignores commits in certain paths** with included regions
   `DorkNet[.]ClientMod/.*`, `DorkNet[.]Quest/.*`, `tools/build_pc[.]py` (one
-  per line) and excluded region `.*[.]md`. The filter compares against the
+  per line) and excluded region `.*[.](md|markdown)`. The filter compares against the
   last build's checkout, so the pipeline keeps it and deletes only `out/`
   and its scratch folders after each run; without a checkout, Jenkins treats
   every push as a change.