diff --git a/README.md b/README.md
index 2e21ef2..5c5bc6b 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,8 @@ Often times we have nested functions in which we would like to preserve the
 context of `this` from its lexical scope. An example is shown below:
 
 ```javascript
+'use strict';
+
 function Person(name) {
     this.name = name;
 }
@@ -1220,4 +1222,4 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 
-<sup>[(back to table of contents)](#table-of-contents)</sup>
\ No newline at end of file
+<sup>[(back to table of contents)](#table-of-contents)</sup>