diff --git a/README.md b/README.md
index 78e99e0..3ddcddf 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,7 @@ Constant operation format (I):
 
 Jump format (J):
 
-	opcode (4) | addr (signed 12)
+	opcode (4) | addr (12)
 
 ## Interrupts