diff --git a/ch01_intro.adoc b/ch01_intro.adoc
index baffd9cc..efda2027 100644
--- a/ch01_intro.adoc
+++ b/ch01_intro.adoc
@@ -232,7 +232,7 @@ its peers.
 
 ===== Who controls the keys
 
-A very((("wallets", "key control")))((("keys", "control of")))((("bitcoins", "key control"))) important additional consideration is _who controls the keys_. As
+A very((("wallets", "key control")))((("keys, control of")))((("bitcoins", "key control"))) important additional consideration is _who controls the keys_. As
 we will see in subsequent chapters, access to bitcoins is
 controlled by "private keys," which are like very long PINs. If
 you are the only one to have control over these private