diff --git a/docs/tutorials/quickstart.ipynb b/docs/tutorials/quickstart.ipynb
index b26d7d70..d0044656 100644
--- a/docs/tutorials/quickstart.ipynb
+++ b/docs/tutorials/quickstart.ipynb
@@ -468,11 +468,13 @@
     "# Compare bin header\n",
     "assert original_segy.binary_header == roundtrip_segy.binary_header\n",
     "\n",
-    "# Compare 100 random trace headers and traces\n",
+    "# Compare 100 random trace headers and samples.\n",
+    "# IBM float32 cannot preserve denormals through IEEE decode/encode.\n",
     "rng = np.random.default_rng()\n",
     "rand_indices = rng.integers(low=0, high=original_segy.num_traces, size=100)\n",
     "for idx in rand_indices:\n",
-    "    np.testing.assert_equal(original_segy.trace[idx], roundtrip_segy.trace[idx])\n",
+    "    np.testing.assert_equal(original_segy.header[idx], roundtrip_segy.header[idx])\n",
+    "    np.testing.assert_allclose(original_segy.sample[idx], roundtrip_segy.sample[idx], rtol=0, atol=1e-37)\n",
     "\n",
     "print(\"Files identical!\")"
    ]