diff --git a/doc/effective_go.html b/doc/effective_go.html
index 41a7b8af93e..9e769aba47c 100644
--- a/doc/effective_go.html
+++ b/doc/effective_go.html
@@ -2603,7 +2603,7 @@ func CubeRoot(x float64) float64 {
}
}
// A million iterations has not converged; something is wrong.
- panic(fmt.Sprintf("CubeRoot(%g) did not converge", x)
+ panic(fmt.Sprintf("CubeRoot(%g) did not converge", x))
}