diff --git a/draft2019_09_keywords.go b/draft2019_09_keywords.go
index f00d2a6..e8507f9 100644
--- a/draft2019_09_keywords.go
+++ b/draft2019_09_keywords.go
@@ -11,6 +11,8 @@ func LoadDraft2019_09() {
 	r.LoadDraft2019_09()
 }
 
+// DefaultIfEmpty populates the KeywordRegistry with the 2019_09
+// jsonschema draft specification.
 func (r *KeywordRegistry) DefaultIfEmpty() {
 	if !r.IsRegistryLoaded() {
 		r.LoadDraft2019_09()
diff --git a/keyword.go b/keyword.go
index 7060201..eb7b18c 100644
--- a/keyword.go
+++ b/keyword.go
@@ -28,6 +28,8 @@ var notSupported = map[string]bool{
 var kr *KeywordRegistry
 var krLock sync.Mutex
 
+// KeywordRegistry contains a mapping of jsonschema keywords and their
+// expected behavior.
 type KeywordRegistry struct {
 	keywordRegistry    map[string]KeyMaker
 	keywordOrder       map[string]int
@@ -52,6 +54,7 @@ func copyGlobalKeywordRegistry() *KeywordRegistry {
 	return kr.Copy()
 }
 
+// Copy creates a new KeywordRegistry populated with the same data.
 func (r *KeywordRegistry) Copy() *KeywordRegistry {
 	dest := &KeywordRegistry{
 		keywordRegistry:    make(map[string]KeyMaker, len(r.keywordRegistry)),