diff --git a/pins.md b/pins.md
index 7e0235a..4a72635 100644
--- a/pins.md
+++ b/pins.md
@@ -1,4 +1,5 @@
- #define ANALOG_A1  36
+```
+#define ANALOG_A1  36
 #define ANALOG_A2  34
 #define ANALOG_A3  35
 #define ANALOG_A4  39
@@ -32,5 +33,6 @@ Ethernet (LAN8720) I/O define:
 RS485:
 RXD:16
 TXD:13
+```
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