diff --git a/README.md b/README.md
index 1c20041..d384367 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,4 @@ I love OS. I implement it.
 
 According to the design principles from MIT's Exokernel, one of library OSes, I implemented this OS from scratch.
 
-I devised essential OS modules such as booting, Memory management, User-level environments, Preemptive multitasking and a sehll.
+I devised essential OS modules such as booting, Memory management, User-level environments, Preemptive multitasking and a shell.