diff --git a/pkg/rss/ISO-8859-1.go b/pkg/rss/ISO-8859-1.go
index 1180485..6214b10 100644
--- a/pkg/rss/ISO-8859-1.go
+++ b/pkg/rss/ISO-8859-1.go
@@ -37,7 +37,7 @@ func (cs *charsetISO88591er) ReadByte() (b byte, err error) {
 
 func (cs *charsetISO88591er) Read(p []byte) (int, error) {
 	// Use ReadByte method.
-	return 0, errors.New("Use ReadByte()")
+	return 0, errors.New("use ReadByte()")
 }
 
 func isCharsetISO88591(charset string) bool {
diff --git a/pkg/rss/rss.go b/pkg/rss/rss.go
index 01ab0e4..23421af 100644
--- a/pkg/rss/rss.go
+++ b/pkg/rss/rss.go
@@ -303,7 +303,7 @@ type Enclosure struct {
 // Get uses http.Get to fetch an enclosure.
 func (e *Enclosure) Get() (io.ReadCloser, error) {
 	if e == nil || e.URL == "" {
-		return nil, errors.New("No enclosure")
+		return nil, errors.New("no enclosure")
 	}
 
 	res, err := http.Get(e.URL)
@@ -325,7 +325,7 @@ type Image struct {
 // Get uses http.Get to fetch an image.
 func (i *Image) Get() (io.ReadCloser, error) {
 	if i == nil || i.URL == "" {
-		return nil, errors.New("No image")
+		return nil, errors.New("no image")
 	}
 
 	res, err := http.Get(i.URL)