diff --git a/book/_config.yml b/book/_config.yml
index a918b00..52f1a81 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -62,7 +62,8 @@ sphinx:                                              # Options passed on to the
     iframe_background:     "#ffffff"                 # Default value (line can be removed), sets the standard background color of non-blended iframes to white, configuration part of Sphinx-Iframes (https://teachbooks.io/manual/external/sphinx-iframes/README.html)
     iframe_width:          calc(100% - 2.8rem)       # Default value (line can be removed), sets the standard width of the iframe within the parent element, configuration part of Sphinx-Iframes (https://teachbooks.io/manual/external/sphinx-iframes/README.html)
     iframe_aspectratio:    auto 2 / 1                # Default value (line can be removed), sets the standard aspect ration of the iframe within the parent element, configuration part of Sphinx-Iframes (https://teachbooks.io/manual/external/sphinx-iframes/README.html)
-    hide_solutions: false                            # Default value (line can be removed), does not hide all solutions from exercises, configuration part of Sphinx-Exercise (https://ebp-sphinx-exercise.readthedocs.io/en/latest/syntax.html)
+    hide_solutions: false                            # Default value (line can be removed), does not hide all solutions from exercises, configuration part of Sphinx-Exercise (https://ebp-sphinx-exercise.readthedocs.io/en/latest/syntax.html#remove-all-solutions)
+    exercise_style: ""                               # Default value (line can be removed), does not simplify solution titles (simplified are useful when solutions directly follow exercises), configuration part of Sphinx-Exercise (https://ebp-sphinx-exercise.readthedocs.io/en/latest/syntax.html#solution-title-styling)
     named_colors_include_CSS:    true                # Default value (line can be removed), includes all CSS colours, configuration part of Sphinx-Named-Colors (https://teachbooks.io/manual/external/Sphinx-Named-Colors/README.html)
     named_colors_dark_and_light: true                # Default value (line can be removed), creates dark mode colours for CSS and custom named colours, configuration part of Sphinx-Named-Colors (https://teachbooks.io/manual/external/Sphinx-Named-Colors/README.html)
     named_colors_saturation:     1.5                 # Default value (line can be removed), sets saturation of CSS and custom named colours in dark mode to 1.5, configuration part of Sphinx-Named-Colors (https://teachbooks.io/manual/external/Sphinx-Named-Colors/README.html)