diff --git a/.gitmodules b/.gitmodules
index f76fc05..fc993b6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,6 +7,9 @@
 [submodule "book/external/deploy-book-workflow"]
 	path = book/external/deploy-book-workflow
 	url = https://github.com/TeachBooks/deploy-book-workflow.git
+[submodule "book/external/latex-to-markdown-conversion"]
+	path = book/external/latex-to-markdown-conversion
+	url = https://gitlab.tudelft.nl/opentextbooks/latex-to-markdown-conversion.git
 [submodule "book/external/Useful_python_code"]
 	path = book/external/Useful_python_code
 	url = https://github.com/TeachBooks/Useful_python_code.git
diff --git a/book/_config.yml b/book/_config.yml
index 6791ac7..8c6fa4e 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -20,11 +20,11 @@ sphinx:
   - sphinx_image_inverter
   - sphinx_exercise
   config:
-    #html_js_files:
-    #- https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.4/require.min.js
-    #thebe_config:
-    #  use_thebe_lite: true
-    #  exclude_patterns: ["**/_*.yml", "**/*.md", "**/*.ipynb","**/*.gif","**/*.txt","**/*.json",]
+    html_js_files:
+    - https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.4/require.min.js
+    thebe_config:
+      use_thebe_lite: true
+      exclude_patterns: ["**/_*.yml", "**/*.md", "**/*.ipynb","**/*.gif","**/*.txt","**/*.json",]
     html_theme_options:
       logo:
         text: Manual
diff --git a/book/external/latex-to-markdown-conversion b/book/external/latex-to-markdown-conversion
new file mode 160000
index 0000000..cb81691
--- /dev/null
+++ b/book/external/latex-to-markdown-conversion
@@ -0,0 +1 @@
+Subproject commit cb8169156e5c0150848cf52fb177d0d40934522e
diff --git a/requirements.txt b/requirements.txt
index c53a2d5..ff54450 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,8 +8,8 @@ teachbooks-sphinx-grasple
 sphinx-image-inverter
 
 
-#--extra-index-url https://gitlab.tudelft.nl/api/v4/projects/11239/packages/pypi/simple
-#sphinx-thebe ~= 0.9.9
+--extra-index-url https://gitlab.tudelft.nl/api/v4/projects/11239/packages/pypi/simple
+sphinx-thebe ~= 0.9.9
 
 docutils==0.17.1
 sphinx-exercise
\ No newline at end of file