diff --git a/README.md b/README.md
index 9b32413..cba9100 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,2 @@
 # CactusTutorial
-A set if Jupyter notebooks designed to teach people how to use Cactus.
+A set of Jupyter notebooks designed to teach people how to use Cactus.