diff --git a/contributors.txt b/contributors.txt
index a3fc335..ec72df2 100644
--- a/contributors.txt
+++ b/contributors.txt
@@ -1 +1,2 @@
 My name is Ben, and I contributed to this project!
+My name is Viridiana 
diff --git a/lib.py b/lib.py
index 4a272bd..b40a3b5 100755
--- a/lib.py
+++ b/lib.py
@@ -8,7 +8,7 @@ def add(a, b):
 
 
 def add1(a):
-    pass
+    return a -  1
 
 
 def sub1(a):