diff --git a/asn1.go b/asn1.go
index 6a90f3f..d50e495 100644
--- a/asn1.go
+++ b/asn1.go
@@ -46,7 +46,7 @@ func decodeASN1String(value *asn1.RawValue) (string, error) {
 		if value.Tag == 12 {
 			// UTF8String
 			if !utf8.Valid(value.Bytes) {
-				return "", errors.New("Malformed UTF8String")
+				return "", errors.New("malformed UTF8String")
 			}
 			return string(value.Bytes), nil
 		} else if value.Tag == 19 || value.Tag == 22 || value.Tag == 20 || value.Tag == 26 {
@@ -74,5 +74,5 @@ func decodeASN1String(value *asn1.RawValue) (string, error) {
 			return stringFromUint32Slice(runes), nil
 		}
 	}
-	return "", errors.New("Not a string")
+	return "", errors.New("not a string")
 }
diff --git a/asn1time.go b/asn1time.go
index 694bf7f..f356d14 100644
--- a/asn1time.go
+++ b/asn1time.go
@@ -253,5 +253,5 @@ func decodeASN1Time(value *asn1.RawValue) (time.Time, error) {
 			return parseGeneralizedTime(value.Bytes)
 		}
 	}
-	return time.Time{}, errors.New("Not a time value")
+	return time.Time{}, errors.New("not a time value")
 }
diff --git a/loglist/load.go b/loglist/load.go
index 19a1f79..ebd402a 100644
--- a/loglist/load.go
+++ b/loglist/load.go
@@ -112,7 +112,7 @@ func Unmarshal(jsonBytes []byte) (*List, error) {
 		return nil, err
 	}
 	if err := list.Validate(); err != nil {
-		return nil, fmt.Errorf("Invalid log list: %s", err)
+		return nil, fmt.Errorf("invalid log list: %s", err)
 	}
 	return list, nil
 }