1 files changed, 2 insertions, 0 deletions
diff --git a/spec.md b/spec.md
index 2954a31..bac7d39 100644
--- a/spec.md
+++ b/spec.md
@@ -35,3 +35,5 @@ XOR    ( a b -- a^b )
 LSF    ( a shift -- c ) left shift
 RSF    ( a shift -- c ) right shift
 SLP    ( -- ) give control back to the interpreter
+INC    ( a -- a+1 )
+DEC    ( a -- a-1 )