diff --git a/ch02_overview.adoc b/ch02_overview.adoc
index c9df3bc5..7f572891 100644
--- a/ch02_overview.adoc
+++ b/ch02_overview.adoc
@@ -50,7 +50,7 @@ it in detail.
 .Block Explorer Privacy Warning
 [WARNING]
 ====
-Searching information on a block explorer may disclose to its operator
+Searching information((("privacy", "blockchain explorers"))) on a block explorer may disclose to its operator
 that you're interested in that information, allowing them to associate
 it with your IP address, browser details, past searches, or other
 identifiable information.  If you look up the transactions in this book,