Update README.md

Quick proofreading fix

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 6823777c9..20892a861 100644
--- a/README.md
+++ b/README.md
@@ -138,7 +138,7 @@ But you can also use them to destructure them inside pattern-matching:
 	  _
 	  #None)
 
-There is also the special **\or** macro, which instroduces *or patterns*
+There is also the special **\or** macro, which introduces *or patterns*
 
 	(deftype Weekday
 	  (| #Monday