diff --git a/README.md b/README.md
index 96ec63c..cd72363 100644
--- a/README.md
+++ b/README.md
@@ -7,13 +7,19 @@
  - Python files: installable, package list, etc
  - $\alpha$-equivalence check
  - Versioning
+ - Automatic church numerals
+ - Prettyprint functions (combine args, rename bound variables)
+ - Documentation in README
+ - Don't crash on errors
 
 ## Todo:
  - live syntax check
  - Command and macro autocomplete
  - step-by-step reduction
- - Documentation in README
  - Maybe a better icon?
  - Warn when overwriting macro
  - Syntax highlighting: parenthesis, bound variables, macros, etc
- - Pin header to top of screen
\ No newline at end of file
+ - Pin header to top of screen
+
+## Mention in Docs
+ - lambda functions only work with single-letter arguments
\ No newline at end of file
diff --git a/main.py b/main.py
index 8edf3bf..e42d202 100755
--- a/main.py
+++ b/main.py
@@ -36,19 +36,19 @@ greeting.show()
 r = runner.Runner()
 
 r.run_lines([
-	"T = λa.λb.a",
-	"F = λa.λb.b",
-	"NOT = \\a.(a F T)",
-	#"AND = a -> b -> (a F b)",
-	#"OR = a -> b -> (a T b)",
-	#"XOR = a -> b -> (a (NOT a b) b)",
-	#"w = x -> (x x)",
-	#"W = (w w)",
-	#"Y = f -> ( (x -> (f (x x))) (x -> (f (x x))) )",
-	#"l = if_true -> if_false -> which -> ( which if_true if_false )"
-	#"inc = n -> f -> x -> (f (n f x))",
-	#"zero = a -> x -> x",
-	#"one = f -> x -> (f x)",
+	"T = λab.a",
+	"F = λab.b",
+	"NOT = λa.(a F T)",
+	"AND = λab.(a F b)",
+	"OR = λab.(a T b)",
+	"XOR = λab.(a (NOT a b) b)",
+	"w = λx.(x x)",
+	"W = (w w)",
+	"Y = λf.( (λx.(f (x x))) (λx.(f (x x))) )",
+	"PAIR = λabi.( i a b )",
+	"inc = λnfa.(f (n f a))",
+	"zero = λax.x",
+	"one = λfx.(f x)"
 ])
 
 
diff --git a/parser.py b/parser.py
index 729c4d1..6e75be1 100755
--- a/parser.py
+++ b/parser.py
@@ -24,7 +24,12 @@ class Parser:
 	# Right associative.
 	#
 	# <var> => <exp>
-	pp_lambda_fun = (pp.Suppress("λ") | pp.Suppress("\\")) + pp_macro + pp.Suppress(".") + pp_expr
+	pp_lambda_fun = (
+		(pp.Suppress("λ") | pp.Suppress("\\")) +
+		pp.Group(pp.Char(pp.alphas)[1, ...]) +
+		pp.Suppress(".") +
+		pp_expr
+	)
 	pp_lambda_fun.set_parse_action(tokens.lambda_func.from_parse)
 
 	# Assignment.
diff --git a/tokens.py b/tokens.py
index 2fdba5f..a30d48f 100755
--- a/tokens.py
+++ b/tokens.py
@@ -207,10 +207,16 @@ class lambda_func(LambdaToken):
 
 	@staticmethod
 	def from_parse(result):
-		return lambda_func(
-			result[0],
-			result[1]
-		)
+		if len(result[0]) == 1:
+			return lambda_func(
+				macro(result[0][0]),
+				result[1]
+			)
+		else:
+			return lambda_func(
+				macro(result[0].pop(0)),
+				lambda_func.from_parse(result)
+			)
 
 	def __init__(
 			self,