diff --git a/README.md b/README.md
index c5e1b39..71720c0 100644
--- a/README.md
+++ b/README.md
@@ -64,7 +64,7 @@ There are two .jed files for the GAL22V10 based address decoder:
 1. **address_decoder.jed** - defines the standard mapping where additional RAM memory is mapped to the regions `$1000-$BFFF` as
 described above. This mapping assumes that your Apple-1 board has "X" and "W" RAM chips populated and mapped to regions
 `$0000-$0FFF` and `$E000-$EFFF`.
-2. **address_decoder1.jed** - defines an alternative mappig allowing tu run Apple-1 Computer entirely from the A1C. The regions
+2. **address_decoder1.jed** - defines an alternative mapping allowing tu run Apple-1 Computer entirely from the A1C. The regions
 `$0000-$0FFF` and `$E000-$EFFF` are additionally mapped to the A1C RAM1 chip. Be sure to remove the "X" and "W" memory chips
 from Apple-1 board for safety, and to disconnect the "X" and "W" lines (if they were mapped to the "0" and "E" segments).