diff --git a/ch01.md b/ch01.md
index fc57e37c..32d68180 100644
--- a/ch01.md
+++ b/ch01.md
@@ -30,7 +30,7 @@ class Flock {
   }
 
   breed(other) {
-    this.seagulls = this.seagulls * other.seagulls;
+    this.seagulls = this.seagulls + other.seagulls + other.seagulls;
     return this;
   }
 }
@@ -43,7 +43,7 @@ const result = flockA
   .breed(flockB)
   .conjoin(flockA.breed(flockB))
   .seagulls;
-// 32
+// 24
 ```
 
 Who on earth would craft such a ghastly abomination? It is unreasonably difficult to keep track of the mutating internal state. And, good heavens, the answer is even incorrect! It should have been `16`, but `flockA` wound up permanently altered in the process. Poor `flockA`. This is anarchy in the I.T.! This is wild animal arithmetic!