diff --git a/ch10.asciidoc b/ch10.asciidoc
index 8bf0dac5..7ee25b09 100644
--- a/ch10.asciidoc
+++ b/ch10.asciidoc
@@ -638,7 +638,7 @@ switching back to hexadecimal:
 </ul>
 ++++
 
-This means that a valid block for height 277,316 is one that has a block header hash that is less than the target. In binary that number must have more than 60 leading bits set to zero. With this level of difficulty, a single miner processing 1 trillion hashes per second (1 terahash per second or 1 TH/sec) would only find a solution once every 8,496 blocks or once every 59 days, on average.
+This means that a valid block for height 277,316 is one that has a block header hash that is less than this target. In binary that number must have more than 60 leading bits set to zero. With this level of difficulty, a single miner processing 1 trillion hashes per second (1 terahash per second or 1 TH/sec) would only find a solution once every 8,496 blocks or once every 59 days, on average.
 
 [[target]]
 ==== Retargeting to Adjust Difficulty