diff --git a/CHANGELOG.md b/CHANGELOG.md
index f9a50b0..09ede20 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## v0.2.1
+
+- Bump license year.
+- Make public API stable.
+- Comment public functions and types.
+
 ## v0.2.0
 
 - Add support for drivers which do not implement `driver.DriverContext`.
diff --git a/README.md b/README.md
index f8742d7..dec2e6b 100644
--- a/README.md
+++ b/README.md
@@ -5,8 +5,6 @@
 
 Go implementation of https://google.github.io/sqlcommenter/.
 
-Public API is not stable, expect breaking changes.
-
 ## Usage with pgx stdlib driver
 
 ```go
diff --git a/attrs.go b/attrs.go
index 808602e..688b472 100644
--- a/attrs.go
+++ b/attrs.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 )
 
+// AttrPairs builds Attrs from multiple key value pairs.
 func AttrPairs(pairs ...string) Attrs {
 	if len(pairs)%2 == 1 {
 		panic("got odd number of pairs")
@@ -15,13 +16,16 @@ func AttrPairs(pairs ...string) Attrs {
 	return attrs
 }
 
+// Attr represents attribute with key and value.
 type Attr struct {
 	Key   string
 	Value string
 }
 
+// Attrs wrap map of attributes.
 type Attrs map[string]string
 
+// Update updates map from other Attrs.
 func (a Attrs) Update(other Attrs) {
 	for k, v := range other {
 		a[k] = v
diff --git a/comment.go b/comment.go
index 4f86dc9..7d4cb14 100644
--- a/comment.go
+++ b/comment.go
@@ -12,6 +12,7 @@ const (
 	commentEnd   = "*/"
 )
 
+// Comment adds comments to query using provided options.
 func Comment(ctx context.Context, query string, opts ...Option) string {
 	if len(opts) == 0 {
 		return query
diff --git a/driver.go b/driver.go
index 125b67e..a7c403d 100644
--- a/driver.go
+++ b/driver.go
@@ -5,6 +5,7 @@ import (
 	"database/sql/driver"
 )
 
+// WrapDriver wraps sql driver with sqlcommenter support.
 func WrapDriver(drv driver.Driver, opts ...Option) driver.Driver {
 	return &commentDriver{
 		drv: drv,
@@ -28,7 +29,7 @@ func (d *commentDriver) Open(name string) (driver.Conn, error) {
 func (d *commentDriver) OpenConnector(name string) (driver.Connector, error) {
 	drvCtx, ok := d.drv.(driver.DriverContext)
 	if !ok {
-		return &dsnConnector{dsn: name, drv: d}, nil
+		return newDSNConnector(name, d), nil
 	}
 
 	ctr, err := drvCtx.OpenConnector(name)
@@ -62,6 +63,13 @@ func (c *connector) Driver() driver.Driver {
 	return c.drv
 }
 
+func newDSNConnector(dsn string, drv *commentDriver) *dsnConnector {
+	return &dsnConnector{
+		dsn: dsn,
+		drv: drv,
+	}
+}
+
 type dsnConnector struct {
 	dsn string
 	drv *commentDriver
diff --git a/options.go b/options.go
index 6c82d93..22ff064 100644
--- a/options.go
+++ b/options.go
@@ -4,18 +4,23 @@ import (
 	"context"
 )
 
+// Option configures commenter.
 type Option func(cmt *commenter)
 
+// AttrProvider provides Attrs from context.Context.
 type AttrProvider interface {
 	GetAttrs(context.Context) Attrs
 }
 
+// AttrProviderFunc adapts func to AttrProvider.
 type AttrProviderFunc func(context.Context) Attrs
 
+// GetAttrs returns Attrs.
 func (f AttrProviderFunc) GetAttrs(ctx context.Context) Attrs {
 	return f(ctx)
 }
 
+// WithAttrs configures commenter with Attrs.
 func WithAttrs(attrs Attrs) Option {
 	return func(cmt *commenter) {
 		cmt.providers = append(cmt.providers, AttrProviderFunc(func(ctx context.Context) Attrs {
@@ -24,6 +29,7 @@ func WithAttrs(attrs Attrs) Option {
 	}
 }
 
+// WithAttrPairs configures commenter with attr pairs.
 func WithAttrPairs(pairs ...string) Option {
 	return func(cmt *commenter) {
 		cmt.providers = append(cmt.providers, AttrProviderFunc(func(ctx context.Context) Attrs {
@@ -32,12 +38,14 @@ func WithAttrPairs(pairs ...string) Option {
 	}
 }
 
+// WithAttrProvider configures commenter with AttrProvider.
 func WithAttrProvider(prov AttrProvider) Option {
 	return func(cmt *commenter) {
 		cmt.providers = append(cmt.providers, prov)
 	}
 }
 
+// WithAttrFunc configures commenter with AttrProviderFunc.
 func WithAttrFunc(fn AttrProviderFunc) Option {
 	return func(cmt *commenter) {
 		cmt.providers = append(cmt.providers, fn)