diff --git a/site/en/guide/autodiff.ipynb b/site/en/guide/autodiff.ipynb
index 237a224569..14d73de93d 100644
--- a/site/en/guide/autodiff.ipynb
+++ b/site/en/guide/autodiff.ipynb
@@ -157,7 +157,7 @@
       },
       "outputs": [],
       "source": [
-        "# dy = 2x * dx\n",
+        "# dy/dx = 2x\n",
         "dy_dx = tape.gradient(y, x)\n",
         "dy_dx.numpy()"
       ]
@@ -396,7 +396,7 @@
         "  tape.watch(x)\n",
         "  y = x**2\n",
         "\n",
-        "# dy = 2x * dx\n",
+        "# dy/dx = 2x\n",
         "dy_dx = tape.gradient(y, x)\n",
         "print(dy_dx.numpy())"
       ]