diff --git a/src/cat.sol b/src/cat.sol
index f359dbcc..856b365e 100644
--- a/src/cat.sol
+++ b/src/cat.sol
@@ -162,7 +162,7 @@ contract Cat {
         vow.fess(mul(dart, rate));
 
         { // Avoid stack too deep
-            // This calcuation will overflow if dart*rate exceeds ~10^14,
+            // This calculation will overflow if dart*rate exceeds ~10^14,
             // i.e. the maximum dunk is roughly 100 trillion DAI.
             uint256 tab = mul(mul(dart, rate), milk.chop) / WAD;
             litter = add(litter, tab);