diff --git a/ch03_bitcoin-core.adoc b/ch03_bitcoin-core.adoc
index e6d38c17..f77140aa 100644
--- a/ch03_bitcoin-core.adoc
+++ b/ch03_bitcoin-core.adoc
@@ -422,7 +422,7 @@ If you're reading this book and interested in strong security, superior
 privacy, or developing Bitcoin software, you should be running your own
 node.
 
-==== Configuring the Bitcoin Core Node
+=== Configuring the Bitcoin Core Node
 
 Bitcoin Core will look for a
 configuration file in its data directory on every start. In this section