diff --git a/.gitmodules b/.gitmodules
index c8898b9..6d31673 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -3070,6 +3070,10 @@
 	path = dom2-core-tests
 	url = ../../pool/dom2-core-tests
 	branch = leap-16.0
+[submodule "doomsday"]
+	path = doomsday
+	url = ../../pool/doomsday
+	branch = leap-16.0
 [submodule "dosbox"]
 	path = dosbox
 	url = ../../pool/dosbox
diff --git a/doomsday b/doomsday
new file mode 160000
index 0000000..259fda2
--- /dev/null
+++ b/doomsday
@@ -0,0 +1 @@
+Subproject commit 259fda21dbb6e6ed5cce1819b2f61cf07ec993bc265b57381012de86e9efd7ce
diff --git a/patchinfo.20260209123942988001.93181000773252/_patchinfo b/patchinfo.20260209123942988001.93181000773252/_patchinfo
new file mode 100644
index 0000000..daaad00
--- /dev/null
+++ b/patchinfo.20260209123942988001.93181000773252/_patchinfo
@@ -0,0 +1,11 @@
+<patchinfo>
+  <packager>eroca</packager>
+  <rating>moderate</rating>
+  <category>recommended</category>
+  <summary>Recommended update for doomsday</summary>
+  <description>This update for doomsday fixes the following issues:
+
+Introduce doomsday.
+</description>
+  <package>doomsday</package>
+</patchinfo>