diff --git a/SeaHavenIndustries.Tests/WorkOrderPhase6Tests.cs b/SeaHavenIndustries.Tests/WorkOrderPhase6Tests.cs
index a73c6f3..ce285c1 100644
--- a/SeaHavenIndustries.Tests/WorkOrderPhase6Tests.cs
+++ b/SeaHavenIndustries.Tests/WorkOrderPhase6Tests.cs
@@ -1930,10 +1930,19 @@ public class WorkOrderCompletionDocFileRulesTests
     }
 
     [Fact]
-    public void MediaRules_StillRejectPdf()
+    public void MediaRules_StillRejectPdfOutsideDocumentCategories()
     {
         // The completion-doc allowlist must not widen the SH-116 media allowlist.
-        Assert.False(WorkOrderMediaFileRules.IsAllowed(FormFile(Pdf, "completion.pdf", "application/pdf")));
+        // SH-171 since added documents to media for Extra and Aveta, which is a
+        // deliberate widening of its own; what this guards is that it stopped
+        // there. Completion is the category SH-337 touches, and a photo slot
+        // must still refuse a PDF.
+        Assert.False(WorkOrderMediaFileRules.IsAllowed(
+            FormFile(Pdf, "completion.pdf", "application/pdf"), WorkOrderMediaCategory.Completion));
+        Assert.False(WorkOrderMediaFileRules.IsAllowed(
+            FormFile(Pdf, "completion.pdf", "application/pdf"), WorkOrderMediaCategory.Before));
+        Assert.False(WorkOrderMediaFileRules.IsAllowed(
+            FormFile(Pdf, "completion.pdf", "application/pdf"), WorkOrderMediaCategory.After));
     }
 }