diff --git a/book/features/sphinx_extensions.md b/book/features/sphinx_extensions.md
index fa53945..f74ed20 100644
--- a/book/features/sphinx_extensions.md
+++ b/book/features/sphinx_extensions.md
@@ -5,4 +5,4 @@
 This section is useful for user type 4-5.
 ```
 
-This sections includes the features developed by TeachBooks which add functionality to the book. Most of them are implemented as sphinx extensions, which are plugins developed for the Sphinx documentation ecosystem (which Jupyter Book is built upon). They extend or modify Sphinx’s capabilities. Since Sphinx extensions are not an integral part of jupyter-book, as opposed to original jupyter-book features, they must be installed and configured explicitly, for example in the `_config.yml` file.
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+This sections includes the features developed by TeachBooks which add functionality to the book. Most of them are implemented as sphinx extensions {bdg-primary}`Sphinx Extension`, which are plugins developed for the Sphinx documentation ecosystem (which Jupyter Book is built upon). They extend or modify Sphinx’s capabilities. Since Sphinx extensions are not an integral part of jupyter-book, as opposed to original jupyter-book features, they must be installed and configured explicitly, for example in the `_config.yml` and `requirements.txt` files.
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