diff --git a/json/src/spec/builtin.rs b/json/src/spec/builtin.rs
index c4e534edb9e..20ebbc3c636 100644
--- a/json/src/spec/builtin.rs
+++ b/json/src/spec/builtin.rs
@@ -18,7 +18,7 @@
 
 use uint::Uint;
 
-/// Pricing for Blake2 compression function: each call costs the same amount per round.
+/// Price per round of Blake2 compression.
 pub type Blake2F = u64;
 
 /// Linear pricing.