diff --git a/Chroma-74H-.md b/Chroma-74H.md
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rename to Chroma-74H.md
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@@ -20,3 +20,8 @@ See [CC1310 Based Chroma Tags](https://github.com/OpenEPaperLink/OpenEPaperLink/
 | :-: | - | - | - | - |
 | "C" | edk511 Issue 1<br>220-00000907-01<br>2021| ? | 60105-00372<br>V03 0129| 
 
+## EPD display
+
+The EPD used on the Chroma74H+ is very similar to the Waveshare 800x480 3-color display used on the Aeon Chroma74 **HOWEVER** it
+doesn't seem to support the partial window opcodes 0x91 and 0x92.<br>
+If these opcodes are avoided the display works with the same code as the Aeon Chroma74.
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