diff --git a/hatmill.go b/hatmill.go
index 14698d8..d011212 100644
--- a/hatmill.go
+++ b/hatmill.go
@@ -26,11 +26,15 @@ func writeStringsTo(w io.Writer, n *int64, ss ...string) error {
 	return nil
 }
 
+// Attrib represents an HTML attribute.
 type Attrib struct {
 	Key   string
 	Value string
 }
 
+// WriteTo writes a to w as an HTML attribute in the form key="value",  or
+// simply key if value is empty. It returns the number of bytes written and any
+// error encountered.
 func (a Attrib) WriteTo(w io.Writer) (n int64, err error) {
 	err = writeStringsTo(w, &n, a.Key)
 	if err != nil {
@@ -42,6 +46,8 @@ func (a Attrib) WriteTo(w io.Writer) (n int64, err error) {
 	return
 }
 
+// EmptyElement represents an empty HTML element, that is one that cannot have
+// children.
 type EmptyElement struct {
 	TagName string
 	Attribs []Attrib
@@ -49,6 +55,8 @@ type EmptyElement struct {
 
 func (EmptyElement) isHtml() {}
 
+// WriteTo writes the HTML markup represented by e to w, returning the number
+// of bytes written and any error encountered.
 func (e EmptyElement) WriteTo(w io.Writer) (n int64, err error) {
 	err = writeStringsTo(w, &n, "<", e.TagName)
 	if err != nil {
@@ -73,6 +81,7 @@ func (e EmptyElement) WriteTo(w io.Writer) (n int64, err error) {
 	return
 }
 
+// ParentElement represents an HTML element that can have children.
 type ParentElement struct {
 	EmptyElement
 	Children []Term
@@ -80,6 +89,8 @@ type ParentElement struct {
 
 func (e ParentElement) isHtml() {}
 
+// WriteTo writes the HTML markup represented by e to w, returning the number
+// of bytes written and any error encountered.
 func (e ParentElement) WriteTo(w io.Writer) (n int64, err error) {
 	n, err = e.EmptyElement.WriteTo(w)
 	if err != nil {
@@ -99,10 +110,13 @@ func (e ParentElement) WriteTo(w io.Writer) (n int64, err error) {
 	return
 }
 
+// Text represents an HTML text node.
 type Text string
 
 func (Text) isHtml() {}
 
+// WriteTo writes the contents of t to w, returning the number of bytes written
+// and any error encountered.
 func (t Text) WriteTo(w io.Writer) (n int64, err error) {
 	err = writeStringsTo(w, &n, string(t))
 	return