diff --git a/examples/tutorial_3_LUPA.ipynb b/examples/tutorial_3_LUPA.ipynb
index 8343f92a..b4cffdd3 100644
--- a/examples/tutorial_3_LUPA.ipynb
+++ b/examples/tutorial_3_LUPA.ipynb
@@ -989,7 +989,7 @@
     "def irregular_wave(hs, tp):\n",
     "    fp = 1/tp\n",
     "    spectrum = lambda f: wot.waves.pierson_moskowitz_spectrum(f, fp, hs)\n",
-    "    efth = wot.waves.omnidirectional_spectrum(f1, nfreq, spectrum, \"Pierson-Moskowitz\",)\n",
+    "    efth = wot.waves.omnidirectional_spectrum(f1, nfreq, spectrum, \"Pierson-Moskowitz\")\n",
     "    return wot.waves.long_crested_wave(efth,nRealizations=5)\n",
     "\n",
     "for case, data in wave_cases.items():\n",