diff --git a/README.md b/README.md
index 60c5a1c..968ef89 100644
--- a/README.md
+++ b/README.md
@@ -26,12 +26,12 @@ a 9V supply rail.
 
 The other pin mappings are as follows:
 
-| PET pin        | ESP pin | Direction | Internal connection |
-|----------------|---------|-----------|---------------------|
-| Cassette Write | RXD     | PET->ESP  | VIA PB3             |
-| Cassette Read  | TXD     | ESP->PET  | PIA1 CA1            |
-| Cassette Motor | CTS     | PET->ESP  | PIA1 CB2            |
-| Cassette Sense | RTS     | ESP->PET  | PIA PA4             |
+| PET pin        | ESP pin | Direction | Cassette #1 internal | Cassette #2 internal |
+|----------------|---------|-----------|----------------------|----------------------|
+| Cassette Write | RXD     | PET->ESP  | VIA PB3              | VIA PB3 (same as #1) |
+| Cassette Read  | TXD     | ESP->PET  | PIA1 CA1             | VIA CB1              |
+| Cassette Motor | CTS     | PET->ESP  | PIA1 CB2             | VIA PB4              |
+| Cassette Sense | RTS     | ESP->PET  | PIA1 PA4             | PIA1 PA5             |
 
 A suitable serial signal (RS-232-like) must be generated/decoded in
 software. Make sure that no cassette port #1 access is generated while