Add note to README about potential conflicts with Markdown All in One

README.md

@@ -45,3 +45,9 @@ All these features can be configured or disabled
 * Selected text is not visibly highlighted if the background color is 100% opaque.  To fix this, [set the alpha channel](https://www.w3schools.com/css/css3_colors.asp) so that background is partially transparent.  This can be done by defining background colors using either of these formats:
 	- `#RRGGBBAA` (ex: `#0A0A0A66` → the "66" is the Alpha channel in hex.  "FF" is 100% opaque, "00" is 100% transparent, 66 is approx 40% opaque)
 	- `rgba(r,g,b,a)` (ex: `rgba(10,10,10,0.40)` → 0.40 is the opacity on a scale of 0.0-1.0)
+
+### Conflicts
+
+The popular extension "Markdown All in One" (yzhang.markdown-all-in-one) also adds colors and decorations to markdown files, some of which overlap and could cause conflicts with this extension.
+
+If you are not seeing the expected behavior from this extension and have "Markdown All in One" also installed, review "Markdown All in One" settings that start with `markdown.extension.theming.decoration` to see if any may be conflicting with this extension.