diff --git a/README.md b/README.md
index 5b79c0cc..e842faa9 100644
--- a/README.md
+++ b/README.md
@@ -153,7 +153,8 @@ Note: all settings are stored in NVRAM and will be reloaded when device starts.
 	0 = ADR off
 	1 = ADR on [default]
 
-	note: set ADR to off, if device is moving, set to on, if not.
+	Note: set ADR to off, if device is moving, set to on, if not.
+	If ADR is set to on, SF value is shown inverted on display.
 
 0x08 do nothing
 
diff --git a/src/main.cpp b/src/main.cpp
index 75cfa8d5..a33e5787 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -318,8 +318,13 @@ uint64_t uptime() {
 
         // update LoRa SF display (line 3)
         u8x8.setCursor(11,3);
-        u8x8.printf("SF:%c%c", lora_datarate[LMIC.datarate * 2], lora_datarate[LMIC.datarate * 2 + 1]);
-
+        u8x8.printf("SF:");
+        if (cfg.adrmode)   // if ADR=on then display SF value inverse
+            u8x8.setInverseFont(1);
+        u8x8.printf("%c%c", lora_datarate[LMIC.datarate * 2], lora_datarate[LMIC.datarate * 2 + 1]);
+        if (cfg.adrmode)   // switch off inverse if it was turned on
+            u8x8.setInverseFont(0);
+        
         // update wifi channel display (line 4)
         u8x8.setCursor(11,4);
         u8x8.printf("ch:%02d", channel);