diff --git a/book/_toc.yml b/book/_toc.yml
index f5ebf5d..9073c86 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -25,6 +25,7 @@ parts:
       - file: exercises/type4.mb
         sections:
         - file: exercises/009.md
+        - file: exercises/010.md
     - file: references.md
     - file: changelog.md
     - file: credits.md
diff --git a/book/exercises/007.md b/book/exercises/007.md
index 745a2a0..e16dbf7 100644
--- a/book/exercises/007.md
+++ b/book/exercises/007.md
@@ -16,9 +16,9 @@ More useful Markdown syntax is explained in the [MyST cheat sheet](https://jupyt
 # Chapter Title 
 ## Section Title 
 ### Subsection Title 
-#### Smaller Heading 
-##### Heading level 5
-###### Heading level 6
+#### Heading 
+##### Smaller Heading
+###### Smallest Heading
 ```
 
 3. Add some text to the (sub)sections to complete your chapter.
diff --git a/book/exercises/010.md b/book/exercises/010.md
new file mode 100644
index 0000000..8c8990e
--- /dev/null
+++ b/book/exercises/010.md
@@ -0,0 +1,3 @@
+# Exercise 10: ...
+
+ghkvkhg
\ No newline at end of file
diff --git a/book/exercises/type4.md b/book/exercises/type4.md
index 59eaaa7..df8b1b4 100644
--- a/book/exercises/type4.md
+++ b/book/exercises/type4.md
@@ -1,4 +1,3 @@
 # User type 4
 
-
 User 4 is a hybrid between type 3 and 5. Basically this user is making changes by editing the .md files locally using, for example, VS Code. Therefore, this user requires a little bit more knowledge on git (think of pulling and pushing changes) but their main focus remains to make adjustments to the content of the book by editing .md files whereas user type 5 has more knowledge to make changes to python files the book as well. This user can build the book online and therefore does not need to have special software installed besides a text editor (e.g., Python is not required). Using this skills, this user type can take the role as editor, managing more than just book content.
\ No newline at end of file