diff --git a/Chapter03/calendar_app.py b/Chapter03/calendar_app.py
index 837ff06..1a1540a 100644
--- a/Chapter03/calendar_app.py
+++ b/Chapter03/calendar_app.py
@@ -146,6 +146,11 @@ def clear_form(self):
         self.event_detail.setPlainText('')
 
     def populate_list(self):
+        # As reported by github user eramey16, we need the following line
+        # to unselect list items since the selected index may not exist
+        # in the new list.  This line is not in the book code.
+        self.event_list.setCurrentRow(-1)
+
         self.event_list.clear()
         self.clear_form()
         date = self.calendar.selectedDate()
diff --git a/Chapter17/QTicTacToe/README.rst b/Chapter17/QTicTacToe/README.rst
index c2d8ef4..c111eed 100644
--- a/Chapter17/QTicTacToe/README.rst
+++ b/Chapter17/QTicTacToe/README.rst
@@ -14,7 +14,7 @@ This is the classic game of **tic-tac-toe**, also known as noughts and crosses.
 Usage
 =====
 
-Simply run `python qtictactoe.py` from within the project folder.
+Simply run `python run.py` from within the project folder.
 
 - Players take turns clicking the mouse on the playing field to mark squares.
 - When one player gets 3 in a row, they win.
diff --git a/README.md b/README.md
index 1f2a6f9..02d948b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
+
+
+
 # Mastering GUI Programming with Python
 
 <a href="https://www.packtpub.com/application-development/mastering-gui-programming-python"><img src="https://www.packtpub.com/media/catalog/product/cache/e4d64343b1bc593f1c5348fe05efa4a6/b/1/b12831.png" alt="Mastering GUI Programming with Python" height="256px" align="right"></a>
@@ -61,6 +64,18 @@ We also provide a PDF file that has color images of the screenshots/diagrams use
 
 Click on the following link to see the Code in Action: [Click here to view the videos](http://bit.ly/2M3QVrl)
 
+## Errata
+
+Page 77: The section of code that describes the "on_category_change" method:
+* Line 3 reads, "dialog = CategoryWindow()", it should read, "self.dialog = CategoryWindow()"
+* Line 4 reads, "dialog.submitted.connect(self.add_category)", it should read, "self.dialog.submitted.connect(self.add_category)"
+
+Page 418: 
+* Here is the ```=__init__()``` method _should be_ Here is the ```__init__()``` method
+
+Page 419: 
+* The ```mousePressEvent())``` method is called _should be_ The ```mousePressEvent()``` method is called
+
 ### Related products
 * Qt5 Python GUI Programming Cookbook [[Packt]](https://www.packtpub.com/application-development/qt5-python-gui-programming-cookbook?utm_source=github&utm_medium=repository&utm_campaign=) [[Amazon]](https://www.amazon.com/dp/B079S4Q9T2)
 
@@ -81,3 +96,7 @@ is a data analyst and software developer who has been solving problems with Pyth
 [Click here](https://docs.google.com/forms/d/e/1FAIpQLSdy7dATC6QmEL81FIUuymZ0Wy9vH1jHkvpY57OiMeKGqib_Ow/viewform) if you have any feedback or suggestions.
 
 
+### Download a free PDF
+
+ <i>If you have already purchased a print or Kindle version of this book, you can get a DRM-free PDF version at no cost.<br>Simply click on the link to claim your free PDF.</i>
+<p align="center"> <a href="https://packt.link/free-ebook/9781789612905">https://packt.link/free-ebook/9781789612905 </a> </p>
\ No newline at end of file