diff --git a/docs/card-key-provider.rst b/docs/card-key-provider.rst
index 7b4bf2c0..390a7c74 100644
--- a/docs/card-key-provider.rst
+++ b/docs/card-key-provider.rst
@@ -1,6 +1,5 @@
-
 Retrieving card-individual keys via CardKeyProvider
-==================================================
+===================================================
 
 When working with a batch of cards, or more than one card in general, it
 is a lot of effort to manually retrieve the card-specific PIN (like