diff --git a/.gitmodules b/.gitmodules
index bb752cd..131ae7c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -34,15 +34,9 @@
 [submodule "scripts"]
 	path = scripts
 	url = https://github.com/open-falcon/scripts.git
-[submodule "doc"]
-	path = doc
-	url = https://github.com/open-falcon/doc.git
 [submodule "common"]
 	path = common
 	url = https://github.com/open-falcon/common.git
-[submodule "open-falcon.github.io"]
-	path = open-falcon.github.io
-	url = https://github.com/open-falcon/open-falcon.github.io.git
 [submodule "task"]
 	path = task
 	url = https://github.com/open-falcon/task.git
diff --git a/doc b/doc
deleted file mode 160000
index 16b0d15..0000000
--- a/doc
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 16b0d1585cc4f2f341de5dc3b1b374edb2e5479b
diff --git a/open-falcon.github.io b/open-falcon.github.io
deleted file mode 160000
index b33f904..0000000
--- a/open-falcon.github.io
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit b33f904dc99060e18b146b3d6efa97b1d0c64aea