diff --git a/README.md b/README.md
index 73d363a..98226af 100644
--- a/README.md
+++ b/README.md
@@ -54,9 +54,16 @@ The manifest file would do several important things:
     * metadata size should not be used as an excuse to sacrifice utility (such as providing checksums over each chunk of a large file)
 
 # Open Questions
+
 * Should the manifest file include checksums of individual file chunks, or just for the whole assembled file?
     * If so, should the chunksize be fixed or dynamic?
 
+* Should the manifest signature format be GnuPG signatures, or those from
+  OpenBSD's signify (of which there is a good [golang
+  implementation](https://github.com/frankbraun/gosignify)?
+
+* Should the on-disk serialization format be proto3 or json?
+
 # Tool Examples
 
 * `mfer gen` / `mfer gen .`
@@ -109,4 +116,4 @@ I would like to be able to plug in a hard drive or flash drive and, if there is
 # Collaboration
 Please email [`sneak@sneak.berlin`](mailto:sneak@sneak.berlin) with your desired username for an account on this Gitea instance.
 
-I am currently interested in hiring a contractor skilled with the Go standard library interfaces to specify this tool in full and develop a prototype implementation.
\ No newline at end of file
+I am currently interested in hiring a contractor skilled with the Go standard library interfaces to specify this tool in full and develop a prototype implementation.