diff --git a/README.md b/README.md
index d3c5764..4842c84 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ fn two_sum _:list _:int i=0 ::
 
 fn add_two_numbers _:list _:list _=[] i=0 ::
 	[] _ l m, _ [] l m -> finish_add_two_numbers l m
-  [n1 | r1] [n2 | r2] l carry
+	[n1 | r1] [n2 | r2] l carry
 		add_two_numbers r1 r2 [rem (carry + n1 + n2) 10) | l] (div n1 + n2 10)
 
 fn finish_add_two_numbers l:list m:int -> m == 0 ? l : [m | l]