diff --git a/03_demo.txt b/03_demo.txt
index b45f36477004ffdc4ade303ed4cbc522f3875f8d..c19703a5b6c8ec9f61dea999561ca0de79e9e9cf 100644
--- a/03_demo.txt
+++ b/03_demo.txt
@@ -1,3 +1,9 @@
+// Notes used by pete in class (not originally intended to be public,
+// but I was asked.....), some of these are examples of
+// correct usage, and some illustrate issues to be fixed in class. Some
+// lines are comments, some are notes to myself. They are not intended
+// to be correct "as is". Use them to explore on your own.
+
 ```go
 func changeB(a:String, b: inout String) {
    b = "\(a)\(b)"
diff --git a/exercises-9-9.md b/exercises-9-9.md
index 65a3865cfa83f6ebb7663d12f297a2c07207f0f3..b897efe5895ff86ea29ac3571d4f3c24b7ee6ce4 100644
--- a/exercises-9-9.md
+++ b/exercises-9-9.md
@@ -1,3 +1,9 @@
+// Notes used by pete in class (not originally intended to be public,
+// but I was asked.....), some of these are examples of
+// correct usage, and some illustrate issues to be fixed in class. Some
+// lines are comments, some are notes to myself. They are not intended
+// to be correct "as is". Use them to explore on your own.
+
 ```swift
 struct Stack<Element> {
       var items = [Element]()