diff --git a/README.md b/README.md
index adfca8b..aa02089 100644
--- a/README.md
+++ b/README.md
@@ -368,8 +368,8 @@ Many instructions have two forms:
 ; Get remainder A%B
 ; This is equivalent to (divr _ REM A B),
 ; except status flags are updated by the remainder value
-(mod Wr Rd Rd-divider)
-(mod RW Rd-divider)
+(mod Wr Rd Rd:divider)
+(mod RW Rd:divider)
 
 ; AND A&B
 (and Wr Rd Rd)