diff --git a/docs/guide/filesystem.ipynb b/docs/guide/filesystem.ipynb
index 845ded4..ec09422 100644
--- a/docs/guide/filesystem.ipynb
+++ b/docs/guide/filesystem.ipynb
@@ -65,43 +65,53 @@
     "\n",
     "```\n",
     "stix2_content/\n",
-    "    /STIX2 Domain Object type\n",
-    "        STIX2 Domain Object\n",
-    "        STIX2 Domain Object\n",
+    "    STIX2 Domain Object type/\n",
+    "        STIX2 Domain Object ID/\n",
+    "            'modified' timestamp.json\n",
+    "            'modified' timestamp.json\n",
+    "        STIX2 Domain Object ID/\n",
+    "            'modified' timestamp.json\n",
     "            .\n",
     "            .\n",
-    "            .\n",
-    "    /STIX2 Domain Object type\n",
-    "        STIX2 Domain Object\n",
-    "        STIX2 Domain Object\n",
+    "    STIX2 Domain Object type/\n",
+    "        STIX2 Domain Object ID/\n",
+    "            'modified' timestamp.json\n",
     "            .\n",
     "            .\n",
     "            .\n",
     "        .\n",
     "        .\n",
     "        .\n",
-    "    /STIX2 Domain Object type\n",
+    "    STIX2 Domain Object type/\n",
     "```\n",
     "\n",
-    "The master STIX 2 content directory contains subdirectories, each of which aligns to a STIX 2 domain object type (i.e. \"attack-pattern\", \"campaign\", \"malware\", etc.). Within each STIX 2 domain object subdirectory are JSON files that are STIX 2 domain objects of the specified type. The name of the json files correspond to the ID of the STIX 2 domain object found within that file. A real example of the FileSystem directory structure:\n",
+    "The master STIX 2 content directory contains subdirectories, each of which aligns to a STIX 2 domain object type (i.e. \"attack-pattern\", \"campaign\", \"malware\", etc.). Within each STIX 2 domain object type's subdirectory are further subdirectories containing JSON files that are STIX 2 domain objects of the specified type; the name of each of these subdirectories is the ID of the associated STIX 2 domain object. Inside each of these subdirectories are JSON files, the names of which correspond to the ``modified`` timestamp of the STIX 2 domain object found within that file. A real example of the FileSystem directory structure:\n",
     "\n",
     "```\n",
     "stix2_content/\n",
     "    /attack-pattern\n",
-    "        attack-pattern--00d0b012-8a03-410e-95de-5826bf542de6.json\n",
-    "        attack-pattern--0a3ead4e-6d47-4ccb-854c-a6a4f9d96b22.json\n",
-    "        attack-pattern--1b7ba276-eedc-4951-a762-0ceea2c030ec.json\n",
+    "        /attack-pattern--00d0b012-8a03-410e-95de-5826bf542de6\n",
+    "            20201211035036648071.json\n",
+    "        /attack-pattern--0a3ead4e-6d47-4ccb-854c-a6a4f9d96b22\n",
+    "            20201210035036648071.json\n",
+    "        /attack-pattern--1b7ba276-eedc-4951-a762-0ceea2c030ec\n",
+    "            20201111035036648071.json\n",
     "    /campaign\n",
     "    /course-of-action\n",
-    "        course-of-action--2a8de25c-f743-4348-b101-3ee33ab5871b.json\n",
-    "        course-of-action--2c3ce852-06a2-40ee-8fe6-086f6402a739.json\n",
+    "        /course-of-action--2a8de25c-f743-4348-b101-3ee33ab5871b\n",
+    "            20201011035036648071.json\n",
+    "        /course-of-action--2c3ce852-06a2-40ee-8fe6-086f6402a739\n",
+    "            20201010035036648071.json\n",
     "    /identity\n",
-    "        identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5.json\n",
+    "        /identity--c78cb6e5-0c4b-4611-8297-d1b8b55e40b5\n",
+    "            20201215035036648071.json\n",
     "    /indicator\n",
     "    /intrusion-set\n",
     "    /malware\n",
-    "        malware--1d808f62-cf63-4063-9727-ff6132514c22.json\n",
-    "        malware--2eb9b131-d333-4a48-9eb4-d8dec46c19ee.json\n",
+    "        /malware--1d808f62-cf63-4063-9727-ff6132514c22\n",
+    "            20201211045036648071.json\n",
+    "        /malware--2eb9b131-d333-4a48-9eb4-d8dec46c19ee\n",
+    "            20201211035036648072.json\n",
     "    /observed-data\n",
     "    /report\n",
     "    /threat-actor\n",
@@ -1408,7 +1418,7 @@
     "# add Campaign object to FileSystemSink\n",
     "fs_sink.add(camp)\n",
     "\n",
-    "# can also add STIX objects to FileSystemSink in on call\n",
+    "# can also add STIX objects to FileSystemSink in one call\n",
     "fs_sink.add([ind, ind1])"
    ]
   }
@@ -1429,7 +1439,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.0a6"
+   "version": "3.6.7"
   }
  },
  "nbformat": 4,