diff --git a/error.go b/error.go
index 65982a5..d00ced3 100644
--- a/error.go
+++ b/error.go
@@ -51,6 +51,7 @@ func NamedError(key string, err error) Field {
 
 type errArray []error
 
+// MarshalLogArray implements zapcore.ArrayMarshaler.
 func (errs errArray) MarshalLogArray(arr zapcore.ArrayEncoder) error {
 	for i := range errs {
 		if errs[i] == nil {
@@ -73,6 +74,7 @@ type errArrayElem struct {
 	error
 }
 
+// MarshalLogObject implements zapcore.ObjectMarshaler.
 func (e *errArrayElem) MarshalLogObject(enc zapcore.ObjectEncoder) error {
 	// Re-use the error field's logic, which supports non-standard error types.
 	Error(e.error).AddTo(enc)
diff --git a/sugar.go b/sugar.go
index 77ca227..3df55b7 100644
--- a/sugar.go
+++ b/sugar.go
@@ -286,6 +286,7 @@ type invalidPair struct {
 	key, value interface{}
 }
 
+// MarshalLogObject implements zapcore.ObjectMarshaler.
 func (p invalidPair) MarshalLogObject(enc zapcore.ObjectEncoder) error {
 	enc.AddInt64("position", int64(p.position))
 	Any("key", p.key).AddTo(enc)
@@ -295,6 +296,7 @@ func (p invalidPair) MarshalLogObject(enc zapcore.ObjectEncoder) error {
 
 type invalidPairs []invalidPair
 
+// MarshalLogArray implements zapcore.ArrayMarshaler.
 func (ps invalidPairs) MarshalLogArray(enc zapcore.ArrayEncoder) error {
 	var err error
 	for i := range ps {