diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 609e6395..d791bae9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -5,4 +5,4 @@ Pull Requests are great.
  3. Add your name to AUTHORS.txt
  4. Push to your fork and submit a pull request.
 
-**Try to use the PEP8 style guide.**
+**Try to use the PEP8 style guide** (and it's ok to have a line length of 100 characters).