diff --git a/ch10.asciidoc b/ch10.asciidoc
index f8ded7e2..d5f54f7e 100644
--- a/ch10.asciidoc
+++ b/ch10.asciidoc
@@ -837,7 +837,7 @@ The following list shows the total hashing power of the bitcoin network, over th
 2009:: 0.5 MH/sec–8 MH/sec (16× growth)
 2010:: 8 MH/sec–116 GH/sec (14,500× growth)
 2011:: 116 GH/sec–9 TH/sec (78× growth)
-2012:: 9 TH/sec–23 TH/sec (2.5× growth)
+2012:: 9 TH/sec–23 TH/sec (2.56#x00D7; growth)
 2013:: 23 TH/sec–10 PH/sec (450× growth)
 2014:: 10 PH/sec–300 PH/sec (30× growth)
 2015:: 300 PH/sec-800 PH/sec (2.66× growth)