fix typo

Mekapaedia · Mekapaedia · commit 430a57c1c3cf · 2015-10-22T21:52:21.000-06:00
diff --git a/README.md b/README.md
@@ -5,7 +5,7 @@ The assembler for the Nibble Knowledge CPU.
 AS4
 ---
 
-AS4 is the low level assembler on written in C99 for the Nibble Knowledge CPU. It is under 700 lines of executable code, and recognises only 12 contructs:
+AS4 is the low level assembler on written in C99 for the Nibble Knowledge CPU. It is under 700 lines of executable code, and recognises only 12 constructs:
 
 ### Useage ###
 There are only two invocations of as4:
