diff --git a/.gitmodules b/.gitmodules
index 3b8e724e15e0e172ae47279a812894e0556c20b7..636993749864ac75e6561544ca117910aa3e1f3c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "solvers/kwmr"]
 	path = solvers/kwmr
 	url = git@togawa-gitlab:adc2019/kawamura-solver.git
+[submodule "solvers/iskw"]
+	path = solvers/iskw
+	url = git@togawa-gitlab:adc2019/solver.git
diff --git a/solvers/iskw b/solvers/iskw
new file mode 160000
index 0000000000000000000000000000000000000000..c79e76603400980611e7d41e17e78512a23291f5
--- /dev/null
+++ b/solvers/iskw
@@ -0,0 +1 @@
+Subproject commit c79e76603400980611e7d41e17e78512a23291f5