diff --git a/source/_components/camera.mjpeg.markdown b/source/_components/camera.mjpeg.markdown
index 4f166f044c4..5cc0c6f3bff 100644
--- a/source/_components/camera.mjpeg.markdown
+++ b/source/_components/camera.mjpeg.markdown
@@ -31,3 +31,7 @@ Configuration variables:
 - **name** *Optional*: This parameter allows you to override the name of your camera.
 - **username** *Optional*: The username for accessing your camera.
 - **password** *Optional*: The password for accessing your camera.
+
+<p class='note'>
+There is a <a href="https://github.com/shazow/urllib3/issues/800" target="_blank">known issue in urllib3</a> that you will get error messages in your logs like <code>[StartBoundaryNotFoundDefect(), MultipartInvariantViolationDefect()], unparsed data: ''</code> but the component still works fine. You can ignore the messages. 
+</p>
diff --git a/source/_components/conversation.markdown b/source/_components/conversation.markdown
index a9f4f200a49..8e52a6927a1 100644
--- a/source/_components/conversation.markdown
+++ b/source/_components/conversation.markdown
@@ -28,6 +28,6 @@ When this component is active and you are using a supported browser voice comman
   <img src="/images/screenshots/voice-commands.png" />
 </p>
 
-<p class='note note'>
+<p class='note'>
 Apple iPhones do not support this feature in any browser. 
 </p>
diff --git a/source/_components/sensor.rest.markdown b/source/_components/sensor.rest.markdown
index 5e55cdda28d..26c3203d471 100644
--- a/source/_components/sensor.rest.markdown
+++ b/source/_components/sensor.rest.markdown
@@ -45,7 +45,7 @@ Configuration variables:
 - **resource** (*Required*): The resource or endpoint that contains the value.
 - **method** (*Optional*): The method of the request. Default is GET.
 - **value_template** (*Optional*): Defines a [template](/topics/templating/) to extract the value.
-- **payload** (*Optional*): The payload to send with a POST request. Usualy formed as a dictionary.
+- **payload** (*Optional*): The payload to send with a POST request. Depends on the service, but usually formed as JSON.
 - **name** (*Optional*): Name of the REST sensor.
 - **unit_of_measurement** (*Optional*): Defines the unit of measurement of the sensor, if any.
 
@@ -66,7 +66,7 @@ In this section you find some real life examples of how to use this sensor.
 
 ### {% linkable_title External IP address %}
 
-Always want to know your external IP address. [JSON Test](http://www.jsontest.com) will provide you this information at their http://ip.jsontest.com/ endpoint.
+You can find your external IP address using the service [JSON Test](http://www.jsontest.com) at their http://ip.jsontest.com/ endpoint.
 
 To display the IP address, the entry for a sensor in the `configuration.yaml` file will look like this.
 
@@ -93,7 +93,7 @@ Add something similar to the entry below to your `configuration.yaml` file:
 
 ### {% linkable_title Value for other Home Assistant instance %}
 
-The Home Assistant [API](/developers/rest_api/) is exposing the data from your attached sensors. If you are running multiple Home Assistant instances which are not [connected](/developers/architecture/#multiple-connected-instances) you can still get information from them.
+The Home Assistant [API](/developers/rest_api/) exposes the data from your attached sensors. If you are running multiple Home Assistant instances which are not [connected](/developers/architecture/#multiple-connected-instances) you can still get information from them.
 
 
 ```yaml
diff --git a/source/_cookbook/customize_polling_interval.markdown b/source/_cookbook/customize_polling_interval.markdown
index e6aff18ebe8..c393d14209a 100644
--- a/source/_cookbook/customize_polling_interval.markdown
+++ b/source/_cookbook/customize_polling_interval.markdown
@@ -7,8 +7,8 @@ sidebar: true
 comments: false
 sharing: true
 footer: true
-ha_category: Example configuration.yaml
----
+ha_category: Customize Defaults
+-------------------------------
 
 Platforms that require polling will be polled in an interval specified by the main component. For example a light will check every 30 seconds for a changed state. It is possible to overwrite this scan interval for any platform that is being polled by specifying a `scan_interval` config key. In the example below we setup the Philips Hue lights but tell Home Assistant to poll the devices every 10 seconds instead of the default 30 seconds.