diff --git a/README.md b/README.md
index fbe53b4..8fbc237 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,8 @@ The code snippets, listings, and projects are all embedded in Jupyter Notebooks
 organized by chapter. Visit [http://jupyter.org/install](http://jupyter.org/install) for
 instructions on installing Jupyter Notebooks.
 
+We keep the original Jupyter Notebooks in their respective chapter folders. As we discover errata, we update notebooks in the Errata folder, so those notebooks are the most up-to-date in terms of errors corrected, but we keep the original Jupyter Notebooks to match the book code snippets.
+
 ## Requirements
 
 In order to run many of the projects, you'll need at least the [NumPy](http://www.numpy.org/) library