diff --git a/ch08_signatures.adoc b/ch08_signatures.adoc
index a7154446..8b8eaa85 100644
--- a/ch08_signatures.adoc
+++ b/ch08_signatures.adoc
@@ -457,7 +457,7 @@ need for the decentralized Bitcoin network.  The first of these is that
 it relies on Bob waiting for Alice to commit to her public nonce and
 then Bob giving her a random challenge scalar.  In Bitcoin, the spender
 of every transaction needs to be authenticated by thousands of Bitcoin
-full nodes--including future nodes that haven't been started yet but
+full nodes—including future nodes that haven't been started yet but
 whose operators will one day want to ensure the bitcoins they receive
 came from a chain of transfers where every transaction was valid.  Any
 Bitcoin node that is unable to communicate with Alice, today or in the