src/conio/cterm.txt

@@ -752,7 +752,8 @@ CSI < Ps c (CTDA)
 	1 - Loadable fonts are availabe via Device Control Strings
 	2 - Palette entries may be modified via an Operating System Command
 	    string
-	3 - Pixel operations are supported (currently, sixel graphics)
+	3 - Pixel operations are supported (currently, sixel and PPM
+	    graphics)
 	4 - The current font may be selected via CSI Ps1 ; Ps2 sp D
 	5 - More than the standard 16 colours may by configured via
 	    Operating System Command strings