@@ -58,7 +58,7 @@
     "import static com.mongodb.client.model.Aggregates.match;\n",
     "import static com.mongodb.client.model.Aggregates.limit;\n",
     "import static com.mongodb.client.model.Aggregates.sort;\n",
-    "import static com.mongodb.client.model.Sorts.ascending;\n",
+    "import static com.mongodb.client.model.Sorts.descending;\n",
     "\n",
     "import org.bson.Document;\n",
     "import org.bson.conversions.Bson;\n",
@@ -121,12 +121,52 @@
     "}"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "74f5fd5a",
+   "metadata": {},
+   "source": [
+    "## $project\n",
+    "\n",
+    "We’ll project only the `title` and `year` fields for the book \"Treasure of the Sun\", excluding the `_id` field from the result."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "50b8aa38",
+   "metadata": {
+    "vscode": {
+     "languageId": "java"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "Bson titleFilter = eq(\"title\", \"Treasure of the Sun\");\n",
+    "Bson matchStage = match(titleFilter);\n",
+    "\n",
+    "Bson projectStage = project(\n",
+    "    fields(\n",
+    "        include(\"title\", \"year\"),\n",
+    "        excludeId()\n",
+    "    )\n",
+    ");\n",
+    "\n",
+    "List<Bson> aggregationPipeline = List.of(matchStage, projectStage);\n",
+    "\n",
+    "AggregateIterable<Document> result = books.aggregate(aggregationPipeline);\n",
+    "\n",
+    "for (Document doc : result) {\n",
+    "    System.out.println(\"book: \" + doc.toJson());\n",
+    "}\n"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "9f6caab3",
    "metadata": {},
    "source": [
-    "### $limit and $project\n",
+    "### $limit\n",
     "\n",
     "We’ll return books published after 2010, limit the result to 10 documents, and project only the year and title fields."
    ]
@@ -174,7 +214,7 @@
    "source": [
     "### $sort\n",
     "\n",
-    "We'll sort the results by publication year in ascending order."
+    "Use `$sort` to order the books by the number of pages in descending order, returning the longest books first."
    ]
   },
   {
@@ -188,15 +228,20 @@
    },
    "outputs": [],
    "source": [
-    "Bson yearFilter = gt(\"year\", 2010);\n",
-    "Bson matchStage = match(yearFilter);\n",
+    "Bson projectStage = project(\n",
+    "    fields(\n",
+    "        include(\"title\", \"pages\"),\n",
+    "        excludeId()\n",
+    "    )\n",
+    ");\n",
+    "\n",
+    "Bson sortStage = sort(descending(\"pages\"));\n",
     "Bson limitStage = limit(10);\n",
-    "Bson sortStage = sort(ascending(\"year\"));\n",
     "\n",
     "List<Bson> aggregationPipeline = List.of(\n",
-    "    matchStage,\n",
-    "    limitStage,\n",
-    "    sortStage\n",
+    "    projectStage,\n",
+    "    sortStage,\n",
+    "    limitStage\n",
     ");\n",
     "\n",
     "AggregateIterable<Document> result = books.aggregate(aggregationPipeline);\n",