diff --git a/README.md b/README.md
index f2ec2a3..672fad6 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ An analog line-out audio signal will be generated by a filter connected to GPIO-
 
 ![AFSK scope screenshot](https://github.com/eleccoder/raspi-pico-aprs-tnc/blob/main/doc/img/afsk_scope.png)
 
-Image: Pico's output signal probed by a DSO. We clearly see the 1200 Hz and 2200 Hz tones of the 1200 Bd 2-AFSK.
+Image: Line-out signal (see below) probed by a DSO. We clearly see the 1200 Hz and 2200 Hz tones of the 1200 Bd 2-AFSK.
 
 Basically, the data/signal flow is as follows: