Update README.md

Author: EvenAR

README.md

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 Shows aircraft position relative to the ILS.
 
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 ## Installation and use
 
 1. Download the latest release from the [Releases](https://github.com/EvenAR/ILS-Window/releases) page.
@@ -11,14 +10,16 @@ Shows aircraft position relative to the ILS.
 
 By default the plugin will automatically open ILS windows based on the active arrival runways. It's also possible to open windows manually using `.ils <title>` (where `<title>` refers to the `"title"` in the configuration file).
 
+> [!NOTE]
+> **Limitation**: This plugin uses the altitude reported by the pilot clients. Depending on the pilot's weather settings and the flight simulator they are using, the height displayed in the ILS Window may not match what the pilot sees (read why [here](https://forums.flightsimulator.com/t/vatsim-ivao-pilotedge-users-be-aware-of-an-important-bug/426142/468)).
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 ## Configuration
 
 The plugin reads the JSON configuration file when the plugin is loaded. For detailed configuration options, refer to [the sample configuration file](/Sample%20config). Worth noticing:
 
 - `localizerCourse` must be the **true** heading in degrees
 - `maxOffsetLeft` and `maxOffsetRight` is used to specify the maximum visible range (in nautical miles) left and right of the localizer. Most relevant for airports with paralell approaches.
 
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 ## Screenshot
 
 ![image](https://github.com/user-attachments/assets/49e513da-1fa5-4483-8823-f557a293c05a)