docs: Mention that "certificateFingerprint" source should be in DER

diff --git a/docs/DISCOVERABLE_PARTITIONS.md b/docs/DISCOVERABLE_PARTITIONS.md
index 936eb14065995108c921d66caff08cce05648d2b..efd20533a5b93f95e72355e5d0ae9788e542183a 100644 (file)
--- a/docs/DISCOVERABLE_PARTITIONS.md
+++ b/docs/DISCOVERABLE_PARTITIONS.md
@@ -280,8 +280,8 @@ size. Currently three fields are defined for the JSON object:
    in `rootHash` above.
 
 3. The (optional) `certificateFingerprint` field should be a string containing
-   a SHA256 fingerprint of the X.509 certificate for the key that signed the
-   root hash, formatted as series of (lowercase) hex characters (no `:`
+   a SHA256 fingerprint of the X.509 certificate in DER format for the key that
+   signed the root hash, formatted as series of (lowercase) hex characters (no `:`
    separators or such).
 
 More fields might be added in later revisions of this specification.