diff --git a/source/conf.py b/source/conf.py
index 558ce57..92a4056 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -51,6 +51,8 @@ language = 'de'
 # This pattern also affects html_static_path and html_extra_path.
 exclude_patterns = []
 
+myst_url_schemes = ['http', 'https', 'mailto', 'ftp', 'mumble']
+
 
 # -- Options for HTML output -------------------------------------------------