Fix grammar issue

diff --git a/docs/Serial.md b/docs/Serial.md
index 9dff6c1ebccbe0256253094d8b61ed1c81426934..3690376086cf020844c1a1f4e8842c5b8d3f8970 100644 (file)
--- a/docs/Serial.md
+++ b/docs/Serial.md
@@ -89,7 +89,7 @@ Please note that the serial device might have a different name (ttyUSB(n), ttyS0
 5) You should see ledgible ASCII text scroll by.
 
 If the device gets all the way through the boot process, the libreCMC banner will appear with
-an shell prompt:
+a shell prompt:
 
 ```
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