diff --git a/src/dog.sol b/src/dog.sol
index d941d80f..e3f3d519 100644
--- a/src/dog.sol
+++ b/src/dog.sol
@@ -220,7 +220,7 @@ contract Dog {
         vow.fess(due);
 
         {   // Avoid stack too deep
-            // This calcuation will overflow if dart*rate exceeds ~10^14
+            // This calculation will overflow if dart*rate exceeds ~10^14
             uint256 tab = mul(due, milk.chop) / WAD;
             Dirt = add(Dirt, tab);
             ilks[ilk].dirt = add(milk.dirt, tab);