diff --git a/README.md b/README.md
index cc09b7b..d24e221 100644
--- a/README.md
+++ b/README.md
@@ -255,7 +255,7 @@ Flags - *aside from L* - are set based on ALU operations, so they depend on
 will refer to the state/value of **AR** *after* an ALU operation.
 
 ### Z
-Set if **AR** == **BUS**
+Set if **AR** == **0**
 
 ### N
 Set if sign bit in **AR** is set.