diff --git a/blockservice/blockservice.go b/blockservice/blockservice.go
index d4f6fffadecd..3969dad69b13 100644
--- a/blockservice/blockservice.go
+++ b/blockservice/blockservice.go
@@ -22,6 +22,8 @@ var log = logging.Logger("blockservice")
 
 var ErrNotFound = errors.New("blockservice: key not found")
 
+// BlockGetter is the common interface shared between blockservice sessions and
+// the blockservice.
 type BlockGetter interface {
 	// GetBlock gets the requested block.
 	GetBlock(ctx context.Context, c *cid.Cid) (blocks.Block, error)
@@ -95,12 +97,14 @@ func NewWriteThrough(bs blockstore.Blockstore, rem exchange.Interface) BlockServ
 	}
 }
 
-func (bs *blockService) Blockstore() blockstore.Blockstore {
-	return bs.blockstore
+// Blockstore returns the blockstore behind this blockservice.
+func (s *blockService) Blockstore() blockstore.Blockstore {
+	return s.blockstore
 }
 
-func (bs *blockService) Exchange() exchange.Interface {
-	return bs.exchange
+// Exchange returns the exchange behind this blockservice.
+func (s *blockService) Exchange() exchange.Interface {
+	return s.exchange
 }
 
 // NewSession creates a bitswap session that allows for controlled exchange of
@@ -286,3 +290,5 @@ func (s *Session) GetBlock(ctx context.Context, c *cid.Cid) (blocks.Block, error
 func (s *Session) GetBlocks(ctx context.Context, ks []*cid.Cid) <-chan blocks.Block {
 	return getBlocks(ctx, ks, s.bs, s.ses)
 }
+
+var _ BlockGetter = (*Session)(nil)
diff --git a/importer/helpers/helpers.go b/importer/helpers/helpers.go
index dbd994c2c685..64b91d38ba4c 100644
--- a/importer/helpers/helpers.go
+++ b/importer/helpers/helpers.go
@@ -65,10 +65,12 @@ func (n *UnixfsNode) SetPrefix(prefix *cid.Prefix) {
 	n.node.SetPrefix(prefix)
 }
 
+// NumChildren returns the number of children referenced by this UnixfsNode.
 func (n *UnixfsNode) NumChildren() int {
 	return n.ufmt.NumChildren()
 }
 
+// Set replaces this UnixfsNode with another UnixfsNode
 func (n *UnixfsNode) Set(other *UnixfsNode) {
 	n.node = other.node
 	n.raw = other.raw
@@ -78,6 +80,7 @@ func (n *UnixfsNode) Set(other *UnixfsNode) {
 	}
 }
 
+// GetChild gets the ith child of this node from the given DAGService.
 func (n *UnixfsNode) GetChild(ctx context.Context, i int, ds node.DAGService) (*UnixfsNode, error) {
 	nd, err := n.node.Links()[i].GetNode(ctx, ds)
 	if err != nil {
@@ -92,8 +95,8 @@ func (n *UnixfsNode) GetChild(ctx context.Context, i int, ds node.DAGService) (*
 	return NewUnixfsNodeFromDag(pbn)
 }
 
-// addChild will add the given UnixfsNode as a child of the receiver.
-// the passed in DagBuilderHelper is used to store the child node an
+// AddChild adds the given UnixfsNode as a child of the receiver.
+// The passed in DagBuilderHelper is used to store the child node an
 // pin it locally so it doesnt get lost
 func (n *UnixfsNode) AddChild(child *UnixfsNode, db *DagBuilderHelper) error {
 	n.ufmt.AddBlockSize(child.FileSize())
@@ -115,7 +118,7 @@ func (n *UnixfsNode) AddChild(child *UnixfsNode, db *DagBuilderHelper) error {
 	return err
 }
 
-// Removes the child node at the given index
+// RemoveChild removes the child node at the given index
 func (n *UnixfsNode) RemoveChild(index int, dbh *DagBuilderHelper) {
 	n.ufmt.RemoveBlockSize(index)
 	n.node.SetLinks(append(n.node.Links()[:index], n.node.Links()[index+1:]...))
@@ -140,7 +143,7 @@ func (n *UnixfsNode) SetPosInfo(offset uint64, fullPath string, stat os.FileInfo
 	}
 }
 
-// getDagNode fills out the proper formatting for the unixfs node
+// GetDagNode fills out the proper formatting for the unixfs node
 // inside of a DAG node and returns the dag node
 func (n *UnixfsNode) GetDagNode() (node.Node, error) {
 	nd, err := n.getBaseDagNode()
diff --git a/importer/importer.go b/importer/importer.go
index 8a07df3df12d..f209f3cc5732 100644
--- a/importer/importer.go
+++ b/importer/importer.go
@@ -1,5 +1,5 @@
-// package importer implements utilities used to create IPFS DAGs from files
-// and readers
+// Package importer implements utilities used to create IPFS DAGs from files
+// and readers.
 package importer
 
 import (
@@ -15,8 +15,8 @@ import (
 	node "gx/ipfs/Qme5bWv7wtjUNGsK2BNGVUFPKiuxWrsqrtvYwCLRw8YFES/go-ipld-format"
 )
 
-// Builds a DAG from the given file, writing created blocks to disk as they are
-// created
+// BuildDagFromFile builds a DAG from the given file, writing created blocks to
+// disk as they are created
 func BuildDagFromFile(fpath string, ds node.DAGService) (node.Node, error) {
 	stat, err := os.Lstat(fpath)
 	if err != nil {
@@ -36,6 +36,8 @@ func BuildDagFromFile(fpath string, ds node.DAGService) (node.Node, error) {
 	return BuildDagFromReader(ds, chunk.DefaultSplitter(f))
 }
 
+// BuildDagFromReader builds a DAG from the chunks returned by the given chunk
+// splitter.
 func BuildDagFromReader(ds node.DAGService, spl chunk.Splitter) (node.Node, error) {
 	dbp := h.DagBuilderParams{
 		Dagserv:  ds,
@@ -45,6 +47,7 @@ func BuildDagFromReader(ds node.DAGService, spl chunk.Splitter) (node.Node, erro
 	return bal.BalancedLayout(dbp.New(spl))
 }
 
+// BuildTrickleDagFromReader is similar to BuildDagFromReader but uses the trickle layout.
 func BuildTrickleDagFromReader(ds node.DAGService, spl chunk.Splitter) (node.Node, error) {
 	dbp := h.DagBuilderParams{
 		Dagserv:  ds,
diff --git a/merkledag/node.go b/merkledag/node.go
index 143e7e07525d..4cb79ca9c33f 100644
--- a/merkledag/node.go
+++ b/merkledag/node.go
@@ -124,7 +124,7 @@ func (n *ProtoNode) AddRawLink(name string, l *node.Link) error {
 	return nil
 }
 
-// Remove a link on this node by the given name
+// RemoveNodeLink removes a link on this node by the given name.
 func (n *ProtoNode) RemoveNodeLink(name string) error {
 	n.encoded = nil
 	good := make([]*node.Link, 0, len(n.links))
@@ -146,7 +146,7 @@ func (n *ProtoNode) RemoveNodeLink(name string) error {
 	return nil
 }
 
-// Return a copy of the link with given name
+// GetNodeLink returns a copy of the link with the given name.
 func (n *ProtoNode) GetNodeLink(name string) (*node.Link, error) {
 	for _, l := range n.links {
 		if l.Name == name {
@@ -160,6 +160,7 @@ func (n *ProtoNode) GetNodeLink(name string) (*node.Link, error) {
 	return nil, ErrLinkNotFound
 }
 
+// GetLinkedProtoNode returns a copy of the ProtoNode with the given name.
 func (n *ProtoNode) GetLinkedProtoNode(ctx context.Context, ds node.DAGService, name string) (*ProtoNode, error) {
 	nd, err := n.GetLinkedNode(ctx, ds, name)
 	if err != nil {
@@ -174,6 +175,7 @@ func (n *ProtoNode) GetLinkedProtoNode(ctx context.Context, ds node.DAGService,
 	return pbnd, nil
 }
 
+// GetLinkedNode returns a copy of the IPLD Node with the given name.
 func (n *ProtoNode) GetLinkedNode(ctx context.Context, ds node.DAGService, name string) (node.Node, error) {
 	lnk, err := n.GetNodeLink(name)
 	if err != nil {
diff --git a/merkledag/utils/diff.go b/merkledag/utils/diff.go
index 2ead4bdf761a..5dfd37fb75b8 100644
--- a/merkledag/utils/diff.go
+++ b/merkledag/utils/diff.go
@@ -37,6 +37,7 @@ func (c *Change) String() string {
 	}
 }
 
+// ApplyChange applies the requested changes to the given node in the given dag.
 func ApplyChange(ctx context.Context, ds node.DAGService, nd *dag.ProtoNode, cs []*Change) (*dag.ProtoNode, error) {
 	e := NewDagEditor(nd, ds)
 	for _, c := range cs {
diff --git a/merkledag/utils/utils.go b/merkledag/utils/utils.go
index dd119834da12..eb4413f155bb 100644
--- a/merkledag/utils/utils.go
+++ b/merkledag/utils/utils.go
@@ -27,6 +27,7 @@ type Editor struct {
 	src node.DAGService
 }
 
+// NewMemoryDagService returns a new, thread-safe in-memory DAGService.
 func NewMemoryDagService() node.DAGService {
 	// build mem-datastore for editor's intermediary nodes
 	bs := bstore.NewBlockstore(syncds.MutexWrap(ds.NewMapDatastore()))
@@ -34,7 +35,10 @@ func NewMemoryDagService() node.DAGService {
 	return dag.NewDAGService(bsrv)
 }
 
-// root is the node to be modified, source is the dagstore to pull nodes from (optional)
+// NewDagEditor returns an ProtoNode editor.
+//
+// * root is the node to be modified
+// * source is the dagstore to pull nodes from (optional)
 func NewDagEditor(root *dag.ProtoNode, source node.DAGService) *Editor {
 	return &Editor{
 		root: root,
@@ -43,17 +47,19 @@ func NewDagEditor(root *dag.ProtoNode, source node.DAGService) *Editor {
 	}
 }
 
+// GetNode returns the a copy of the root node being edited.
 func (e *Editor) GetNode() *dag.ProtoNode {
 	return e.root.Copy().(*dag.ProtoNode)
 }
 
+// GetDagService returns the DAGService used by this editor.
 func (e *Editor) GetDagService() node.DAGService {
 	return e.tmp
 }
 
 func addLink(ctx context.Context, ds node.DAGService, root *dag.ProtoNode, childname string, childnd node.Node) (*dag.ProtoNode, error) {
 	if childname == "" {
-		return nil, errors.New("cannot create link with no name!")
+		return nil, errors.New("cannot create link with no name")
 	}
 
 	// ensure that the node we are adding is in the dagservice
@@ -188,6 +194,8 @@ func (e *Editor) rmLink(ctx context.Context, root *dag.ProtoNode, path []string)
 	return root, nil
 }
 
+// Finalize writes the new DAG to the given DAGService and returns the modified
+// root node.
 func (e *Editor) Finalize(ctx context.Context, ds node.DAGService) (*dag.ProtoNode, error) {
 	nd := e.GetNode()
 	err := copyDag(ctx, nd, e.tmp, ds)
diff --git a/mfs/dir.go b/mfs/dir.go
index 5ad39d20503a..901f69952f15 100644
--- a/mfs/dir.go
+++ b/mfs/dir.go
@@ -40,6 +40,10 @@ type Directory struct {
 	name string
 }
 
+// NewDirectory constructs a new MFS directory.
+//
+// You probably don't want to call this directly. Instead, construct a new root
+// using NewRoot.
 func NewDirectory(ctx context.Context, name string, node node.Node, parent childCloser, dserv node.DAGService) (*Directory, error) {
 	db, err := uio.NewDirectoryFromNode(dserv, node)
 	if err != nil {
diff --git a/path/resolver.go b/path/resolver.go
index 71ac52ba0f3d..68865283addb 100644
--- a/path/resolver.go
+++ b/path/resolver.go
@@ -40,6 +40,7 @@ type Resolver struct {
 	ResolveOnce func(ctx context.Context, ds node.DAGService, nd node.Node, names []string) (*node.Link, []string, error)
 }
 
+// NewBasicResolver constructs a new basic resolver.
 func NewBasicResolver(ds node.DAGService) *Resolver {
 	return &Resolver{
 		DAG:         ds,
diff --git a/tar/format.go b/tar/format.go
index 327d1fd2cba1..e1426fdad1f7 100644
--- a/tar/format.go
+++ b/tar/format.go
@@ -34,6 +34,8 @@ func marshalHeader(h *tar.Header) ([]byte, error) {
 	return buf.Bytes(), nil
 }
 
+// ImportTar imports a tar file into the given DAGService and returns the root
+// node.
 func ImportTar(ctx context.Context, r io.Reader, ds node.DAGService) (*dag.ProtoNode, error) {
 	tr := tar.NewReader(r)
 
diff --git a/unixfs/hamt/hamt.go b/unixfs/hamt/hamt.go
index 2974d4928059..e0b063e4f7b6 100644
--- a/unixfs/hamt/hamt.go
+++ b/unixfs/hamt/hamt.go
@@ -66,6 +66,7 @@ type child interface {
 	Label() string
 }
 
+// NewHamtShard creates a new, empty HAMT shard with the given size.
 func NewHamtShard(dserv node.DAGService, size int) (*HamtShard, error) {
 	ds, err := makeHamtShard(dserv, size)
 	if err != nil {
@@ -93,6 +94,7 @@ func makeHamtShard(ds node.DAGService, size int) (*HamtShard, error) {
 	}, nil
 }
 
+// NewHamtFromDag creates new a HAMT shard from the given DAG.
 func NewHamtFromDag(dserv node.DAGService, nd node.Node) (*HamtShard, error) {
 	pbnd, ok := nd.(*dag.ProtoNode)
 	if !ok {
diff --git a/unixfs/io/dirbuilder.go b/unixfs/io/dirbuilder.go
index bc9eb6c8e467..cc3a3905cebb 100644
--- a/unixfs/io/dirbuilder.go
+++ b/unixfs/io/dirbuilder.go
@@ -51,6 +51,8 @@ func NewDirectory(dserv node.DAGService) *Directory {
 // ErrNotADir implies that the given node was not a unixfs directory
 var ErrNotADir = fmt.Errorf("merkledag node was not a directory or shard")
 
+// NewDirectoryFromNode loads a unixfs directory from the given IPLD node and
+// DAGService.
 func NewDirectoryFromNode(dserv node.DAGService, nd node.Node) (*Directory, error) {
 	pbnd, ok := nd.(*mdag.ProtoNode)
 	if !ok {
diff --git a/unixfs/io/pbdagreader.go b/unixfs/io/pbdagreader.go
index 8f0f22d3b098..85cbc19688cb 100644
--- a/unixfs/io/pbdagreader.go
+++ b/unixfs/io/pbdagreader.go
@@ -50,6 +50,7 @@ type pbDagReader struct {
 
 var _ DagReader = (*pbDagReader)(nil)
 
+// NewPBFileReader constructs a new PBFileReader.
 func NewPBFileReader(ctx context.Context, n *mdag.ProtoNode, pb *ftpb.Data, serv node.DAGService) *pbDagReader {
 	fctx, cancel := context.WithCancel(ctx)
 	curLinks := getLinkCids(n)
diff --git a/unixfs/test/utils.go b/unixfs/test/utils.go
index 8b234c9ad4f2..1e44b1e9c789 100644
--- a/unixfs/test/utils.go
+++ b/unixfs/test/utils.go
@@ -27,6 +27,7 @@ func SizeSplitterGen(size int64) chunk.SplitterGen {
 	}
 }
 
+// GetDAGServ returns a mock DAGService.
 func GetDAGServ() node.DAGService {
 	return mdagmock.Mock()
 }
@@ -51,6 +52,7 @@ func init() {
 	UseBlake2b256.Prefix.MhLength = -1
 }
 
+// GetNode returns a unixfs file node with the specified data.
 func GetNode(t testing.TB, dserv node.DAGService, data []byte, opts NodeOpts) node.Node {
 	in := bytes.NewReader(data)
 
@@ -69,10 +71,12 @@ func GetNode(t testing.TB, dserv node.DAGService, data []byte, opts NodeOpts) no
 	return node
 }
 
+// GetEmptyNode returns an empty unixfs file node.
 func GetEmptyNode(t testing.TB, dserv node.DAGService, opts NodeOpts) node.Node {
 	return GetNode(t, dserv, []byte{}, opts)
 }
 
+// GetRandomNode returns a random unixfs file node.
 func GetRandomNode(t testing.TB, dserv node.DAGService, size int64, opts NodeOpts) ([]byte, node.Node) {
 	in := io.LimitReader(u.NewTimeSeededRand(), size)
 	buf, err := ioutil.ReadAll(in)
@@ -96,6 +100,7 @@ func ArrComp(a, b []byte) error {
 	return nil
 }
 
+// PrintDag pretty-prints the given dag to stdout.
 func PrintDag(nd *mdag.ProtoNode, ds node.DAGService, indent int) {
 	pbd, err := ft.FromBytes(nd.Data())
 	if err != nil {