diff --git a/.gitmodules b/.gitmodules
index 5d6b1fe..de694bb 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -41,6 +41,7 @@
 [submodule "book/external/annotater"]
 	path = book/external/annotater
 	url = https://github.com/TeachBooks/annotater
+        branch = manual
 [submodule "book/external/Sphinx-launch-buttons"]
 	path = book/external/Sphinx-launch-buttons
 	url = https://github.com/TeachBooks/Sphinx-launch-buttons.git