diff --git a/cmd/certdump/certdump.go b/cmd/certdump/certdump.go
index 57feadd..6bfb64d 100644
--- a/cmd/certdump/certdump.go
+++ b/cmd/certdump/certdump.go
@@ -185,8 +185,11 @@ func displayCert(cert *x509.Certificate) {
 func displayAllCerts(in []byte, leafOnly bool) {
 	certs, err := helpers.ParseCertificatesPEM(in)
 	if err != nil {
-		Warn(TranslateCFSSLError(err), "failed to parse certificates")
-		return
+		certs, _, err = helpers.ParseCertificatesDER(in, "")
+		if err != nil {
+			Warn(TranslateCFSSLError(err), "failed to parse certificates")
+			return
+		}
 	}
 
 	if len(certs) == 0 {
diff --git a/lib/defs.go b/lib/defs.go
index c3227eb..04072c8 100644
--- a/lib/defs.go
+++ b/lib/defs.go
@@ -4,6 +4,8 @@ package lib
 
 const (
 	// ExitSuccess is the successful exit status.
+	//
+	// It should be called on successful exit.
 	ExitSuccess = 0
 
 	// ExitFailure is the failing exit status.
diff --git a/lib/lib.go b/lib/lib.go
index b717c7b..e59a98a 100644
--- a/lib/lib.go
+++ b/lib/lib.go
@@ -11,6 +11,8 @@ var progname = filepath.Base(os.Args[0])
 
 // ProgName returns what lib thinks the program name is, namely the
 // basename of of argv0.
+//
+// It is similar to the Linux __progname.
 func ProgName() string {
 	return progname
 }