diff --git a/module.yaml b/module.yaml
index f7767b5..e3e9d18 100644
--- a/module.yaml
+++ b/module.yaml
@@ -29,3 +29,13 @@ outputs:
 # zip, quick-xml). No filesystem, no network. The empty list makes
 # this explicit; the hub enforces it.
 permissions: []
+
+# MIME-type allow-list for the `document` input. Studio reads this
+# through ModuleInfoResponse.accepts_mime and uses it as the OS
+# file-picker filter so operators don't accidentally pick a `.png`
+# for a PDF-extract step. Same list documented inline next to
+# `inputs.document` above; kept synchronised by hand for now.
+accepts_mime:
+  - application/pdf
+  - application/x-pdf
+  - application/vnd.openxmlformats-officedocument.wordprocessingml.document