diff --git a/glossary.asciidoc b/glossary.asciidoc
index 82fd3e4f..7b853428 100644
--- a/glossary.asciidoc
+++ b/glossary.asciidoc
@@ -55,7 +55,7 @@ difficulty retargeting::
 difficulty target::
     A difficulty at which all the computation in the network will find blocks approximately every 10 minutes.
 
-Double spending::
+double spending::
     Double-spending is the result of successfully spending some money more than once. Bitcoin protects against double spending by verifying each transaction added to the block chain to ensure that the inputs for the transaction had not previously already been spent.
 
 ECDSA::