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diff --git a/arithmetic.mdwn b/arithmetic.mdwn
index dd59863e..74a354d5 100644
--- a/arithmetic.mdwn
+++ b/arithmetic.mdwn
@@ -1,3 +1,4 @@
+Here are a bunch of pre-tested operations for the untyped lambda calculus. In some cases multiple versions are offered.
 
 	; booleans
 	let true = \y n. y  in ; aka K