diff --git a/ssh/cipher.go b/ssh/cipher.go
index 13484ab..22bb30c 100644
--- a/ssh/cipher.go
+++ b/ssh/cipher.go
@@ -392,7 +392,9 @@
 	c.incIV()
 
 	padding := plain[0]
-	if padding < 4 || padding >= 20 {
+	if padding < 4 {
+		// padding is a byte, so it automatically satisfies
+		// the maximum size, which is 255.
 		return nil, fmt.Errorf("ssh: illegal padding %d", padding)
 	}