diff --git a/willow/crypto/zk_rlwe_relation.rs b/willow/crypto/zk_rlwe_relation.rs
index f3c1548..5768316 100644
--- a/willow/crypto/zk_rlwe_relation.rs
+++ b/willow/crypto/zk_rlwe_relation.rs
@@ -681,10 +681,10 @@ impl<'a> ZeroKnowledgeProver<RlweRelationProofStatement<'a>, RlweRelationProofWi
             let rho = rho_vec[j];
             // Evaluate the private polynomials at rho.
             // Unlike the other polynomials we are evaluating (a*r) and (v*p) can exceed 2^128 (for
-            // large q) so we split the polynomials in this section into upper and lower
-            // parts to avoid overflow. We use base q as this will  be convenient in the
-            // following calculations and we don't mind the smaller part exceeding q so
-            // long as it doesn't overflow the 128bit type.
+            // large q) so we split the polynomials in this section into upper and lower parts to
+            // avoid overflow. We use base q as this will  be convenient in the following
+            // calculations and we don't mind the smaller part exceeding q so long as it doesn't
+            // overflow the 128bit type.
             //
             // We make the upper part signed so we can represent negative numbers.
             let mut arrho_upper = 0i128;
@@ -753,8 +753,7 @@ impl<'a> ZeroKnowledgeProver<RlweRelationProofStatement<'a>, RlweRelationProofWi
         // powers of rho.
         // The concatenation of these public vectors we now write into the public_vec for the inner
         // product proof. Followed by the public half of -q*wrho i.e. just the scalar -q (with the
-        // relevant tau powers). The expected result of the inner product is also computed
-        // here.
+        // relevant tau powers). The expected result of the inner product is also computed here.
         let (mut public_vec, mut result) = create_public_vec(
             &rho_vec,
             &arho_vec,
diff --git a/willow/proto/willow/committee_selector.proto b/willow/proto/willow/committee_selector.proto
index b35fe21..f1588d8 100644
--- a/willow/proto/willow/committee_selector.proto
+++ b/willow/proto/willow/committee_selector.proto
@@ -198,6 +198,11 @@ message CheckVolunteerStatusResponse {
 
   // Authorization token to use for future requests.
   string auth_token = 4 ;
+
+  // Optional: If the member was selected, the member's identifier within the
+  // committee, in the range [1, committee_size]. The member sends it as
+  // `member_id` or `sender_member_id` in its later requests.
+  int64 member_id = 5 ;
 }
 
 // Generic error status returned from the TEE to the untrusted frontend for the
diff --git a/willow/protocol/messages.rs b/willow/protocol/messages.rs
index 08c911e..26b4f09 100644
--- a/willow/protocol/messages.rs
+++ b/willow/protocol/messages.rs
@@ -187,8 +187,8 @@ impl<Vahe: VaheBase> Debug for PartialDecryptionRequest<Vahe> {
 pub struct PartialDecryptionResponse<Kahe: KaheBase, Vahe: VaheBase> {
     pub partial_decryption: Vahe::PartialDecryption,
     // This contribution just contains encrypted DP noise. The server will be forced to include
-    // this contribution in the result because the randomness of the AHE encryption was
-    // included in the partial decryption request.
+    // this contribution in the result because the randomness of the AHE encryption was included in
+    // the partial decryption request.
     pub dp_ciphertext_contribution: Option<CiphertextContribution<Kahe, Vahe>>,
 }