diff --git a/SSTV.md b/SSTV.md
index cc0843d..8df9440 100644
--- a/SSTV.md
+++ b/SSTV.md
@@ -3,4 +3,7 @@ The SSTV app allows you to send .bmp images that you have loaded onto the SD car
 ## Sending
 To send an image, select the bitmap image with the jog wheel, the mode, and the frequency you'd like to transmit on. For amateur radio, 12kHz seems to produce a good image.
 
+## Image requirements
+Only 24bit BMP files with a size of 256X320 pixels are supported
+
 ![](https://imgur.com/a/sRqVuE4)
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