diff --git a/.gitmodules b/.gitmodules
index 38b7159..3d2557b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "binding/ip2region4php"]
 	path = binding/ip2region4php
 	url = https://git.oschina.net/monsterkiller/ip2region.git
+[submodule "binding/php_ext"]
+	path = binding/php_ext
+	url = git@github.com:dongyado/ip2region.git
diff --git a/binding/php_ext b/binding/php_ext
new file mode 160000
index 0000000..d46d396
--- /dev/null
+++ b/binding/php_ext
@@ -0,0 +1 @@
+Subproject commit d46d396a3c927a1cd259bd64038c58d42b1d678b