diff --git a/futures.ipynb b/futures.ipynb
index 700f196a..4dafbcc5 100644
--- a/futures.ipynb
+++ b/futures.ipynb
@@ -204,8 +204,8 @@
     "\n",
     "for i in range(256):\n",
     "    x = client.submit(inc, i)     # x = inc(i)\n",
-    "    y = client.submit(double, x)  # y = inc(x)\n",
-    "    z = client.submit(add, x, y)  # z = inc(y)\n",
+    "    y = client.submit(double, x)  # y = double(x)\n",
+    "    z = client.submit(add, x, y)  # z = add(x, y)\n",
     "    zs.append(z)"
    ]
   },