diff --git a/rdf/RDF.ipynb b/rdf/RDF.ipynb
index bd6c19e..bd70e0a 100644
--- a/rdf/RDF.ipynb
+++ b/rdf/RDF.ipynb
@@ -89,7 +89,7 @@
     "editable": false,
     "nbgrader": {
      "cell_type": "markdown",
-     "checksum": "27164b58076ba5ec8929d9652528a1bb",
+     "checksum": "753edf07d500cc7f9cc9c5a4c0a1348e",
      "grade": false,
      "grade_id": "cell-d8db3c16cee92ac1",
      "locked": true,
@@ -160,9 +160,9 @@
     "@prefix foaf: <http://xmlns.com/foaf/0.1/> .\n",
     "@prefix rel: <http://www.perceive.net/schemas/relationship/> .\n",
     "\n",
-    "<#green-goblin> a foaf:Person ;             # Green Goblin is a person (in the universe of Marvel)\n",
+    "<#green-goblin> a foaf:Person ;             # Green Goblin is a person\n",
     "                foaf:name \"Green Goblin\" ;\n",
-    "                rel:enemyOf <#spiderman> .  # Green Goblin is one of Spiderman's enemy \n",
+    "                rel:enemyOf <#spiderman> .  # Green Goblin is one of Spiderman's enemies \n",
     "\n",
     "<#spiderman> a foaf:Person ;  # Spiderman is also a person\n",
     "             foaf:name \"Spiderman\", \"Человек-паук\"@ru .  # Spiderman's name in Russian is Человек-паук\n",