diff --git a/cookbook/tutorials/gfp_design.ipynb b/cookbook/tutorials/gfp_design.ipynb
index 550434b..52b6ee2 100644
--- a/cookbook/tutorials/gfp_design.ipynb
+++ b/cookbook/tutorials/gfp_design.ipynb
@@ -212,9 +212,9 @@
     "prompt.structure[-1] = 4097\n",
     "# ... and then we fill in structure tokens at key residues near the alpha helix\n",
     "# kink and at the stabilizing R and E positions on the beta barrel.\n",
-    "prompt.structure[55:70] = template_gfp_tokens.structure[56:71]\n",
-    "prompt.structure[93] = template_gfp_tokens.structure[93]\n",
-    "prompt.structure[219] = template_gfp_tokens.structure[219]\n",
+    "prompt.structure[55 + 1 : 70 + 1] = template_gfp_tokens.structure[55 + 1 : 70 + 1]\n",
+    "prompt.structure[93 + 1] = template_gfp_tokens.structure[93 + 1]\n",
+    "prompt.structure[219 + 1] = template_gfp_tokens.structure[219 + 1]\n",
     "\n",
     "print(\"\".join([\"✔\" if st < 4096 else \"_\" for st in prompt.structure]))"
    ]