diff --git a/docs/guide/parsing.ipynb b/docs/guide/parsing.ipynb
index 0762c6c..5346d16 100644
--- a/docs/guide/parsing.ipynb
+++ b/docs/guide/parsing.ipynb
@@ -691,7 +691,14 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Parsing custom STIX objects and/or STIX objects with custom properties is also completed easily with [parse()](../api/stix2.core.rst#stix2.core.parse). Just supply the keyword argument ``allow_custom=True``. When ``allow_custom`` is specified, [parse()](../api/stix2.core.rst#stix2.core.parse) will attempt to convert the supplied STIX content to known STIX 2 domain objects and/or previously defined [custom STIX 2 objects](custom.ipynb). If the conversion cannot be completed (and ``allow_custom`` is specified), [parse()](../api/stix2.core.rst#stix2.core.parse) will treat the supplied STIX 2 content as valid STIX 2 objects and return them. **Warning: Specifying allow_custom may lead to critical errors if further processing (searching, filtering, modifying etc...) of the custom content occurs where the custom content supplied is not valid STIX 2**. This is an axiomatic possibility as the ``stix2`` library cannot guarantee proper processing of unknown custom STIX 2 objects that were explicitly flagged to be allowed, and thus may not be valid.\n",
+    "Parsing custom STIX objects and/or STIX objects with custom properties is also completed easily with [parse()](../api/stix2.core.rst#stix2.core.parse). Just supply the keyword argument ``allow_custom=True``. When ``allow_custom`` is specified, [parse()](../api/stix2.core.rst#stix2.core.parse) will attempt to convert the supplied STIX content to known STIX 2 domain objects and/or previously defined [custom STIX 2 objects](custom.ipynb). If the conversion cannot be completed (and ``allow_custom`` is specified), [parse()](../api/stix2.core.rst#stix2.core.parse) will treat the supplied STIX 2 content as valid STIX 2 objects and return them. This is an axiomatic possibility as the ``stix2`` library cannot guarantee proper processing of unknown custom STIX 2 objects that were explicitly flagged to be allowed, and thus may not be valid.\n",
+    "<div class=\"alert alert-warning\">\n",
+    "\n",
+    "**Warning**\n",
+    "\n",
+    "Specifying allow_custom may lead to critical errors if further processing (searching, filtering, modifying etc...) of the custom content occurs where the custom content supplied is not valid STIX 2\n",
+    "\n",
+    "</div>\n",
     "\n",
     "For examples of parsing STIX 2 objects with custom STIX properties, see [Custom STIX Content: Custom Properties](custom.ipynb#Custom-Properties)\n",
     "\n",
diff --git a/docs/guide/workbench.ipynb b/docs/guide/workbench.ipynb
index 3cce593..c0c4ee0 100644
--- a/docs/guide/workbench.ipynb
+++ b/docs/guide/workbench.ipynb
@@ -775,7 +775,7 @@
    "source": [
     "<div class=\"alert alert-warning\">\n",
     "\n",
-    "**Warning:**\n",
+    "**Warning**\n",
     "\n",
     "The workbench layer replaces STIX Object classes with special versions of them that use \"wrappers\" to provide extra functionality. Because of this, we recommend that you **either use the workbench layer or the rest of the library, but not both**. In other words, don't import from both ``stix2.workbench`` and any other submodules of ``stix2``.\n",
     "\n",