diff --git a/ch09.asciidoc b/ch09.asciidoc
index 11ee818b..207bde40 100644
--- a/ch09.asciidoc
+++ b/ch09.asciidoc
@@ -215,7 +215,7 @@ Proof of stake is a system by which existing owners of a currency can "stake" cu
 
 * Block generation: 10 minutes
 * Total currency: No limit
-* Consensus algorithm: Proof of work with protein folding research
+* Consensus algorithm: Proof of work with protein-folding research
 * Market capitalization: $58,000 in mid-2014
 
 ===== Gridcoin