diff --git a/src/pages/functors/cats.md b/src/pages/functors/cats.md
index 74e6ead6..4acf9458 100644
--- a/src/pages/functors/cats.md
+++ b/src/pages/functors/cats.md
@@ -77,7 +77,7 @@ no matter what functor context it's in:
 ```scala mdoc:silent
 def doMath[F[_]](start: F[Int])
     (implicit functor: Functor[F]): F[Int] =
-  start.map(n => n + 1 * 2)
+  start.map(n => (n + 1) * 2)
 
 import cats.instances.option._ // for Functor
 import cats.instances.list._   // for Functor
diff --git a/src/pages/intro/contributors.md b/src/pages/intro/contributors.md
index 63233cc3..a5a6934d 100644
--- a/src/pages/intro/contributors.md
+++ b/src/pages/intro/contributors.md
@@ -25,6 +25,7 @@ Francis Devereux,
 Ghislain Vaillant,
 Gregor Ihmor,
 Henk-Jan Meijer,
+Janek Bogucki,
 Janne Pelkonen,
 Jason Scott,
 Javier Arrieta,