diff --git a/helper/ssh/key_pair.go b/helper/ssh/key_pair.go
index 72dd5b7f6..fd052dc2e 100644
--- a/helper/ssh/key_pair.go
+++ b/helper/ssh/key_pair.go
@@ -17,7 +17,8 @@ import (
 )
 
 const (
-	// That's a lot of bits.
+	// defaultRsaBits is the default bits of entropy for a new RSA
+	// key pair. That's a lot of bits.
 	defaultRsaBits = 4096
 
 	// Markers for various SSH key pair types.