diff --git a/docs/design.md b/docs/design.md
index 6c3585e..cd45686 100644
--- a/docs/design.md
+++ b/docs/design.md
@@ -225,6 +225,24 @@ cannot replace it because a KEM cannot produce the CMS signature.
   blocked; the RFC posture only shapes defaults and opinion).
 - **pkiStatus:** SUCCESS (0), FAILURE (2), PENDING (3). **failInfo:** badAlg (0), badMessageCheck
   (1), badRequest (2), badTime (3), badCertId (4), plus optional `failInfoText`.
+- **CMS content type (RFC 8894 §3.2):** the outer SignedData `encapContentInfo.eContentType` (and the
+  matching `content-type` signed attribute) is `id-data` - the `envelopedData` OID belongs only to the
+  inner pkcsPKIEnvelope's own `ContentInfo`, not the outer encapsulated content.
+- **CertRep signature verification:** the response signature is checked against the certs embedded in
+  the CertRep **and** the cached GetCACert bundle, so a valid signature whose signer cert the server did
+  not embed is still confirmed. A mismatch/failure is diagnosed, not just flagged: the note reports the
+  *claimed* signer (issuer+serial or subjectKeyIdentifier), the cert actually used to verify (and whether
+  it came from the CertRep or GetCACert), and how many candidates were tried - so a server-implementor can
+  tell a genuinely invalid signature from "we picked cert X but cert Y signed / the signer cert was not
+  provided."
+
+### PENDING enrollment lifecycle
+
+When `get`/`enroll` returns PENDING the subject key and request metadata are persisted under
+`servers/<id>/pending/<txn>/` (keyed by transaction id). A later `poll` reloads that key, signs the
+CertPoll with it (RFC 8894 §3.3.2 - the GetCertInitial must be signed by the original enrollment key, so
+the CA returns the certificate bound to it), and on success stores the issued cert paired with the key
+(then clears the pending record) so it lists, renews, and exports like a synchronous enrollment.
 
 ### Renewal variants
 
diff --git a/docs/scepclient-usage.md b/docs/scepclient-usage.md
index 90f6912..49b465a 100644
--- a/docs/scepclient-usage.md
+++ b/docs/scepclient-usage.md
@@ -21,10 +21,10 @@ Unknown flags are rejected (e.g. a typo'd `--keyspec` errors rather than silentl
 ## Test with it - exercise a server for RFC 8894 compliance
 | Command | Purpose |
 |---|---|
-| `scepclient diagnose <serverId>` | read-only health check: caps, CA/RA cert details, and whether requests can be enveloped (spot a wrong RA/CA cert without enrolling) |
+| `scepclient diagnose <serverId> [-v]` | read-only health check: caps, CA/RA cert details, and whether requests can be enveloped (spot a wrong RA/CA cert without enrolling). On an HTTP error the server's response body is surfaced inline (so a 500 shows *why*, not a bare status); `-v` traces the resolved request URLs |
 | `scepclient getcacaps <serverId>` | GetCACaps |
 | `scepclient getcacert <serverId> [-v]` | GetCACert (`-v` prints full cert details: KeyUsage, EKU, validity, thumbprint) / `getnextcacert <serverId>` |
-| `scepclient poll <serverId> --issuer <dn> --subject <dn> --txn <id>` | CertPoll |
+| `scepclient poll <serverId> --issuer <dn> --subject <dn> --txn <id> [--key-pass <pw>]` | CertPoll: completes a PENDING enrollment. Signs the poll with the original enrollment key (saved when `get`/`enroll` returned PENDING) and, on success, stores the issued cert+key so it appears in `certs list` and can be renewed/exported. `--key-pass` unlocks the saved key if it was encrypted |
 | `scepclient getcert <serverId> --issuer <dn> --serial <hex>` | GetCert |
 | `scepclient getcrl <serverId> --issuer <dn> --serial <hex>` | GetCRL |
 | `scepclient servers suggest <id>` | capability/security advice |