diff --git a/.gitmodules b/.gitmodules
index 31cdbbc34e515da00beb5dfa4c79cdc8b5e5777e..e618537e3b110b02fec94e4fc9429ad3ec4b5599 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "solvers/hsgw"]
 	path = solvers/hsgw
 	url = git@togawa-gitlab:kento.hasegawa/adc2019solver.git
+[submodule "solvers/twd"]
+	path = solvers/twd
+	url = git@togawa-gitlab:adc2019/twd-solver.git
diff --git a/solvers/twd b/solvers/twd
new file mode 160000
index 0000000000000000000000000000000000000000..4f55318539a2e020819b189171b7686a70752815
--- /dev/null
+++ b/solvers/twd
@@ -0,0 +1 @@
+Subproject commit 4f55318539a2e020819b189171b7686a70752815