Updated CLI_Usage (markdown)

CLI_Usage.md

@@ -189,4 +189,19 @@ If you use the **--dry-run** (**-d**) switch, then some rules don't apply. For o
 apprise --tag=team,email --dry-run
 ```
 
-Happy notifying!
+### :baggage_claim: Message Body Source
+The Apprise CLI doesn't know what you are feeding it when sending a message to a Notification provider. It just assumes that whatever you message you feed it, it should just pass it along *as is* to the upstream provider *as text*.  In most cases, this is perfect and this is the default behaviour. If you are passing along HTML content or markdown content, you should just let Apprise know by specifying the `--input-format` (`-i`) switch. For example:
+```bash
+# An HTML Example:
+cat test.html | apprise --input-format=html
+
+# Or Markdown:
+cat << _EOF | apprise --input-format=markdown
+## Ways to Prepare Eggs
+* Scrambled
+* Sunny Side Up
+* Over Easy
+
+There is more, but I want to keep my message short. :)
+_EOF
+```