diff --git a/index.md b/index.md
index 6491349..d6d523b 100644
--- a/index.md
+++ b/index.md
@@ -28,7 +28,7 @@ This course not only focuses on tools, but on how these tools can become a part
 
 [Objects](objects.html)
 
-Environment - [Affine Transformatino](affine.html) and [Oscillatiors](/)
+Environment - [Affine Transformation](affine.html) and [Oscillators](/)
 
 [Simulation](/)