diff --git a/ftp.go b/ftp.go
index 861854e..cae0c63 100644
--- a/ftp.go
+++ b/ftp.go
@@ -217,7 +217,7 @@ func (c *ServerConn) epsv() (port int, err error) {
 	start := strings.Index(line, "|||")
 	end := strings.LastIndex(line, "|")
 	if start == -1 || end == -1 {
-		err = errors.New("Invalid EPSV response format")
+		err = errors.New("invalid EPSV response format")
 		return
 	}
 	port, err = strconv.Atoi(line[start+3 : end])
@@ -235,7 +235,7 @@ func (c *ServerConn) pasv() (host string, port int, err error) {
 	start := strings.Index(line, "(")
 	end := strings.LastIndex(line, ")")
 	if start == -1 || end == -1 {
-		err = errors.New("Invalid PASV response format")
+		err = errors.New("invalid PASV response format")
 		return
 	}
 
@@ -243,7 +243,7 @@ func (c *ServerConn) pasv() (host string, port int, err error) {
 	pasvData := strings.Split(line[start+1:end], ",")
 
 	if len(pasvData) < 6 {
-		err = errors.New("Invalid PASV response format")
+		err = errors.New("invalid PASV response format")
 		return
 	}
 
@@ -421,7 +421,7 @@ func (c *ServerConn) CurrentDir() (string, error) {
 	end := strings.LastIndex(msg, "\"")
 
 	if start == -1 || end == -1 {
-		return "", errors.New("Unsuported PWD response format")
+		return "", errors.New("unsuported PWD response format")
 	}
 
 	return msg[start+1 : end], nil
diff --git a/parse.go b/parse.go
index 884e3b6..59326c1 100644
--- a/parse.go
+++ b/parse.go
@@ -8,7 +8,7 @@ import (
 	"time"
 )
 
-var errUnsupportedListLine = errors.New("Unsupported LIST line")
+var errUnsupportedListLine = errors.New("unsupported LIST line")
 
 type parseFunc func(string, time.Time, *time.Location) (*Entry, error)
 
@@ -132,7 +132,7 @@ func parseLsListLine(line string, now time.Time, loc *time.Location) (*Entry, er
 	case 'l':
 		e.Type = EntryTypeLink
 	default:
-		return nil, errors.New("Unknown entry type")
+		return nil, errors.New("unknown entry type")
 	}
 
 	if err := e.setTime(fields[5:8], now, loc); err != nil {
@@ -246,7 +246,7 @@ func (e *Entry) setTime(fields []string, now time.Time, loc *time.Location) (err
 
 	} else { // only the date
 		if len(fields[2]) != 4 {
-			return errors.New("Invalid year format in time string")
+			return errors.New("invalid year format in time string")
 		}
 		timeStr := fmt.Sprintf("%s %s %s 00:00", fields[1], fields[0], fields[2])
 		e.Time, err = time.ParseInLocation("_2 Jan 2006 15:04", timeStr, loc)