diff --git a/LICENSE b/LICENSE
index 2fb2c65..c3510b2 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2020 yhirose
+Copyright (c) 2021 yhirose
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 12d98a2..6d94fc0 100644
--- a/README.md
+++ b/README.md
@@ -335,7 +335,7 @@ S <- '(' ↑ P ')' / '"' ↑ P '"' / P
 P <- 'a' / 'b' / 'c'
 ```
 
-When we parse `(z` with the above grammar, we don't have to backtrack in `S` after `(` is matched because a cut operator is inserted there.
+When we parse `(z` with the above grammar, we don't have to backtrack in `S` after `(` is matched, because a cut operator is inserted there.
 
 Parameterized Rule or Macro
 ---------------------------
@@ -713,4 +713,4 @@ Sample codes
 License
 -------
 
-MIT license (© 2020 Yuji Hirose)
+MIT license (© 2021 Yuji Hirose)