diff --git a/README.md b/README.md
index 1d2435f..bc6455d 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# \ambda - A Lambda calculator written in Haskell
+# \lambda - A Lambda calculator written in Haskell
 
 > Inspired by the course "Funktionale Programmierung" @ FU Berlin
 
diff --git a/pylambda.py b/pylambda.py
index e656258..055145e 100644
--- a/pylambda.py
+++ b/pylambda.py
@@ -44,7 +44,7 @@ def areduce(self):
             try:
                 self.rename_bound(f, rest.pop())
             except:
-                RuntimeError("Ran out of letters")
+                raise RuntimeError("Ran out of letters")
 
     def breduce(self):
         ...