diff --git a/.gitmodules b/.gitmodules
index e8d4f9d..cb9052f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,7 @@
 [submodule "src/dependency/tinygltf"]
 	path = src/dependency/tinygltf
 	url = https://github.com/syoyo/tinygltf
+[submodule "src/dependency/imgui"]
+	path = src/dependency/imgui
+	url = https://github.com/ocornut/imgui
+	branch = docking
diff --git a/src/dependency/imgui b/src/dependency/imgui
new file mode 160000
index 0000000..afd659b
--- /dev/null
+++ b/src/dependency/imgui
@@ -0,0 +1 @@
+Subproject commit afd659bb926c94f32928ec586205e27075e93c92