diff --git a/README b/README
index 512b495..60a112a 100644
--- a/README
+++ b/README
@@ -44,9 +44,14 @@ gobyexample.com signups
 * ruby and nodejs killer apps
 
 = topics
-* gzip
-* listing files
 * regular expressions
+* time
+* connection pool
+* typed json parse/unparse
+* web app
+* gzip
+* base64 encoding
+* listing files
 * tls server
 * tls client
 * https server
@@ -57,28 +62,19 @@ gobyexample.com signups
 * http streaming client
 * http proxy
 * templating
-* web app
 * hipache port
-* templating
 * ssh
 * dns
 * timers
 * tty
 * iota
-* apps with multiple named binaries
-* versioned transitive libraries and pegging
-* creating and distributing packages, putting on github
-* distributing go binary programs
-* deploying to heroku
-* sort-by
-* errors
-* compilation
-* time
 * oauth for google domains
-* connection pool
-* typed json parse/unparse
+* testing
 
+* setting up go env, hello world
 * deploying to heroku
+* distributing go binary programs
+* apps with multiple named binaries
 * shipping a package (structure, github, docs)
 
 * blackfriday
diff --git a/src/xx-dns.go b/src/xx-dns.go
new file mode 100644
index 0000000..e777656
--- /dev/null
+++ b/src/xx-dns.go
@@ -0,0 +1,7 @@
+package main
+
+import ("net/dns", "fmt")
+
+func main() {
+	// https://github.com/miekg/dns/blob/master/ex/q/q.go
+}
\ No newline at end of file
diff --git a/src/xx-errors.go b/src/xx-errors.go
new file mode 100644
index 0000000..290a5e5
--- /dev/null
+++ b/src/xx-errors.go
@@ -0,0 +1,19 @@
+package main
+
+import ("fmt"; "errors")
+
+func myFun(arg int) (int, error) {
+	if arg == 42 {
+		return -1, errors.New("Can't work with 42")
+		
+	}
+	return arg + 3, nil
+}
+
+func main() {
+	r, _ := myFun(7)
+	fmt.Println(r)
+
+	_, e := myFun(42)
+	fmt.Println(e)
+}