diff --git a/lib/tasks/import_debian.rake b/lib/tasks/import_debian.rake
index c82d6a3..833bcb5 100644
--- a/lib/tasks/import_debian.rake
+++ b/lib/tasks/import_debian.rake
@@ -38,9 +38,17 @@ BLACKLIST_SECTION_PATTERN = [
 # List of regular expressions. If the package's short description
 # matches any of these then the package will not be imported.
 # Transitional/dummy stub packages exist only to ease upgrades to a
-# renamed or split package and never get a useful screenshot.
+# renamed or split package and never get a useful screenshot. Debian
+# has no dedicated metadata field for this - the Developer's Reference
+# (6.9.7) documents these exact phrases as the convention package
+# maintainers use, and as what deborphan --guess-dummy looks for.
+# Deliberately not matching a bare "dummy": too many real packages use
+# that word for actual functionality (e.g. xserver-xorg-video-dummy,
+# fence-agents-dummy, "double dummy solver" bridge card libraries).
 BLACKLIST_DESCRIPTION_PATTERN = [
   /transitional/i,
+  /dummy package/i,
+  /dependency package/i,
 ]
 
 # Whether to delete a blacklisted package from the database