diff --git a/06_lightning_architecture.asciidoc b/06_lightning_architecture.asciidoc
index 331c178..c21dd1b 100644
--- a/06_lightning_architecture.asciidoc
+++ b/06_lightning_architecture.asciidoc
@@ -16,7 +16,7 @@ image::images/mtln_0601.png[]
 
 ((("architecture, Lightning Network","layers")))The five layers of the Lightning Network, from the bottom up, are:
 
-Network connection layer:: This contains the protocols that interact directly with the internet core protocols (TCP/IP), overlay protocols (Tor v2/v3), and internet services (DNS). This layer also contains the cryptographic transport protocols that protect Lightning messages.
+Network connection layer:: This contains the protocols that interact directly with the internet core protocols (TCP/IP), overlay protocols (Tor v2/v3), and internet services (DNS). This layer also contains the cryptographic transport protocols that protect Lightning pass:[<span class="keep-together">messages</span>].
 
 Messaging layer:: This layer contains the protocols that nodes use to negotiate features, format messages, and encode message fields.