diff --git a/frappe/__init__.py b/frappe/__init__.py
index a504d824c1..036cc371c3 100644
--- a/frappe/__init__.py
+++ b/frappe/__init__.py
@@ -2321,7 +2321,8 @@ def get_website_settings(key):
 	return local.website_settings.get(key)
 
 
-def get_system_settings(key):
+def get_system_settings(key: str):
+	"""Get the value associated with the given `key` from System Settings DocType."""
 	if not hasattr(local, "system_settings"):
 		try:
 			local.system_settings = get_cached_doc("System Settings")