diff --git a/glossary.asciidoc b/glossary.asciidoc
index 7b853428..ebd69085 100644
--- a/glossary.asciidoc
+++ b/glossary.asciidoc
@@ -86,7 +86,7 @@ hash::
 hashlocks::
     A hashlock is a type of encumbrance that restricts the spending of an output until a specified piece of data is publicly revealed. Hashlocks have the useful property that once any hashlock is opened publicly, any other hashlock secured using the same key can also be opened. This makes it possible to create multiple outputs that are all encumbered by the same hashlock and which all become spendable at the same time.
 
-HD Protocol::
+HD protocol::
     The Hierarchical Deterministic (HD) key creation and transfer protocol (BIP32), which allows creating child keys from parent keys in a hierarchy.
 
 HD wallet::