diff --git a/ch07_authorization-authentication.adoc b/ch07_authorization-authentication.adoc
index 07ff0049..70bc491e 100644
--- a/ch07_authorization-authentication.adoc
+++ b/ch07_authorization-authentication.adoc
@@ -233,7 +233,7 @@ on the ((("scripts", "input/output", "examples of", startref="script-input-outpu
 [[script_exec]]
 ===== Separate execution of output and input scripts
 
-In the original Bitcoin
+In the ((("scripts", "input/output", "separate execution")))((("input scripts", "separate execution from output scripts")))((("output scripts", "separate execution from input scripts")))original Bitcoin
 client, output and input scripts were concatenated and executed
 in sequence. For security reasons, this was changed in 2010 because of
 a vulnerability known as the +1 OP_RETURN+ bug.  In the current