Fix typo in comment section: .a[...] -> .v[...]
Change-Id: I2116645938c4552ed495e371bfdbcaf62a443461
diff --git a/include/ceres/jet.h b/include/ceres/jet.h
index 74ce1e9..123b711 100644
--- a/include/ceres/jet.h
+++ b/include/ceres/jet.h
@@ -106,8 +106,8 @@
// Jet<double, 2> y(1); // Pick the 1st dual number for y.
// Jet<double, 2> z = f(x, y);
//
-// LOG(INFO) << "df/dx = " << z.a[0]
-// << "df/dy = " << z.a[1];
+// LOG(INFO) << "df/dx = " << z.v[0]
+// << "df/dy = " << z.v[1];
//
// Most users should not use Jet objects directly; a wrapper around Jet objects,
// which makes computing the derivative, gradient, or jacobian of templated
