diff --git a/book/en-us/02-usability.md b/book/en-us/02-usability.md
index 2c5dc99..95df99c 100644
--- a/book/en-us/02-usability.md
+++ b/book/en-us/02-usability.md
@@ -61,7 +61,7 @@ int main() {
         std::cout << "NULL == nullptr" << std::endl;
 
     foo(0);          // will call foo(int)
-    // foo(NULL);    // doen't compile
+    // foo(NULL);    // doesn't compile
     foo(nullptr);    // will call foo(char*)
     return 0;
 }
diff --git a/code/2/2.01.nullptr.cpp b/code/2/2.01.nullptr.cpp
index 0b59157..8fc1763 100644
--- a/code/2/2.01.nullptr.cpp
+++ b/code/2/2.01.nullptr.cpp
@@ -22,7 +22,7 @@ int main() {
         std::cout << "NULL == nullptr" << std::endl;
 
     foo(0);          // will call foo(int)
-    // foo(NULL);    // doen't compile
+    // foo(NULL);    // doesn't compile
     foo(nullptr);    // will call foo(char*)
     return 0;
 }