diff --git a/src/main/rx/sumd.c b/src/main/rx/sumd.c
index b25e2a582b..faddff15cd 100644
--- a/src/main/rx/sumd.c
+++ b/src/main/rx/sumd.c
@@ -44,8 +44,9 @@
 
 // driver for SUMD receiver using UART2
 
-// Support for SUMD, and SUMD v3
-// Should probably work up to 32 (MZ-32 and SUMD V3) channels
+// Support for SUMD and SUMD V3
+// Tested with 16 channels, SUMD supports up to 16(*), SUMD V3 up to 32 (MZ-32) channels, but limit to MAX_SUPPORTED_RC_CHANNEL_COUNT (currently 8, BF 3.4)
+// * According to the original SUMD V1 documentation, SUMD V1 already supports up to 32 Channels?!?
 
 #define SUMD_SYNCBYTE 0xA8
 #define SUMD_MAX_CHANNEL 32