diff --git a/.gitignore b/.gitignore
index ba6537e0..8ea8b795 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,7 +14,6 @@
 # A handy place to put stuff that git should ignore:
 /ignore/
 support/async/
-support/jsdom/
 support/node-htmlparser/
 support/node-o3-xml/
 support/requirejs/
diff --git a/.gitmodules b/.gitmodules
index 141555c2..750565f5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "doc/wiki"]
 	path = doc/wiki
 	url = git://github.com/ajaxorg/ace.wiki.git
+[submodule "support/jsdom"]
+	path = support/jsdom
+	url = git://github.com/ajaxorg/jsdom.git
diff --git a/support/jsdom b/support/jsdom
new file mode 160000
index 00000000..51938ca1
--- /dev/null
+++ b/support/jsdom
@@ -0,0 +1 @@
+Subproject commit 51938ca15ac7bd16f94e534cda3779f8a0a9f130