diff --git a/farsight.go b/farsight.go
index 6e28205..d90ea9d 100644
--- a/farsight.go
+++ b/farsight.go
@@ -125,10 +125,10 @@ func setField(doc parser.Document, field reflect.Value) error {
 		}
 	case reflect.Slice:
 		// Decompose document into list and prepare destination slice.
-		list := doc.List()
-		slice := reflect.MakeSlice(field.Type(), len(list), cap(list))
+		docs := doc.Slice()
+		slice := reflect.MakeSlice(field.Type(), len(docs), cap(docs))
 
-		for i, d := range list {
+		for i, d := range docs {
 			if err := setField(d, slice.Index(i)); err != nil {
 				return err
 			}
diff --git a/parser/html/html.go b/parser/html/html.go
index e2dcc02..183507c 100644
--- a/parser/html/html.go
+++ b/parser/html/html.go
@@ -89,9 +89,9 @@ func (h *HTMLDocument) Filter(sel string) (parser.Document, error) {
 	return sub, nil
 }
 
-// List decomposes the target HTMLDocument into a slice of HTMLDocument types,
+// Slice decomposes the target HTMLDocument into a slice of HTMLDocument types,
 // each containing a single node from the parent's list of nodes.
-func (h *HTMLDocument) List() []parser.Document {
+func (h *HTMLDocument) Slice() []parser.Document {
 	var docs []parser.Document
 
 	for _, n := range h.nodes {
diff --git a/parser/parser.go b/parser/parser.go
index 1a17534..fd708ee 100644
--- a/parser/parser.go
+++ b/parser/parser.go
@@ -10,13 +10,15 @@ import (
 	"io"
 )
 
+// Parser is an interface that wraps the Parse method.
 type Parser interface {
 	Parse(io.Reader) (Document, error)
 }
 
+// Document is an interface that represents a generic, introspect-able document.
 type Document interface {
 	Filter(attr string) (Document, error)
-	List() []Document
+	Slice() []Document
 	String() string
 }
 
diff --git a/source/source.go b/source/source.go
index e34af98..2781433 100644
--- a/source/source.go
+++ b/source/source.go
@@ -11,15 +11,16 @@ import (
 	"strings"
 )
 
-type Source interface {
+// Fetcher is an interface that wraps the Fetch method.
+type Fetcher interface {
 	Fetch(src string) (io.Reader, error)
 }
 
 // A map of all registered sources.
-var sources map[string]Source
+var sources map[string]Fetcher
 
 // Register a source under a unique name.
-func Register(name string, rcvr Source) error {
+func Register(name string, rcvr Fetcher) error {
 	if _, exists := sources[name]; exists {
 		return fmt.Errorf("Source '%s' already registered, refusing to overwrite", name)
 	}
@@ -43,5 +44,5 @@ func Fetch(src string) (io.Reader, error) {
 }
 
 func init() {
-	sources = make(map[string]Source)
+	sources = make(map[string]Fetcher)
 }