diff --git a/ch10.asciidoc b/ch10.asciidoc
index 13143bed..548d887e 100644
--- a/ch10.asciidoc
+++ b/ch10.asciidoc
@@ -383,7 +383,7 @@ $ ./satoshi-words
 
 At the time that block 277,316 was mined, the version number describing the block structure is version 2, which is encoded in little-endian format in 4 bytes as +0x02000000+.
 
-Next, the mining node needs to add the "Previous Block Hash" (also known as +prevhash+). That is the hash of the block header of block 277,315, the previous block received from the network, which Jing's node has accepted and selected as the _parent_ of the candidate block 277,316. The block header hash for block 277,315 is:
+((("blocks", "parent blocks")))((("parent blocks")))Next, the mining node needs to add the "Previous Block Hash" (also known as +prevhash+). That is the hash of the block header of block 277,315, the previous block received from the network, which Jing's node has accepted and selected as the _parent_ of the candidate block 277,316. The block header hash for block 277,315 is:
 
 ----
 0000000000000002a7bbd25a417c0374cc55261021e8a9ca74442b01284f0569