clarify

1 files changed, 1 insertions, 1 deletions

diff --git a/Cost.hs b/Cost.hs
index 38b6e28..ba3017b 100644
--- a/Cost.hs
+++ b/Cost.hs
@@ -9,7 +9,7 @@ import Data.Monoid
 
 -- | An estimated cost to perform an operation.
 data Cost op 
-	= CPUCost Seconds
+	= CPUCost Seconds -- ^ using 1 CPU core
 	| GPUCost Seconds
 	| CombinedCost (Cost op) (Cost op)
 	deriving (Show)