diff --git a/bobbin/crates/xrpc/src/lib.rs b/bobbin/crates/xrpc/src/lib.rs
index 3979f3a5..f8f883a0 100644
--- a/bobbin/crates/xrpc/src/lib.rs
+++ b/bobbin/crates/xrpc/src/lib.rs
@@ -1006,7 +1006,7 @@ impl HasSubject for PullRecord {
 }
 impl HasSubject for FeedCommentRecord {
     const SHAPE: SubjectShape =
-        SubjectShape::OneOfCollections(&["sh.tangled.repo.issue", "sh.tangled.repo.pull"]);
+        SubjectShape::OneOfCollections(&["sh.tangled.repo.issue", "sh.tangled.repo.pull", "sh.tangled.string"]);
 }
 impl HasSubject for LabelDefinitionRecord {
     const SHAPE: SubjectShape = SubjectShape::BareDid;
diff --git a/bobbin/crates/xrpc/tests/aggregation.rs b/bobbin/crates/xrpc/tests/aggregation.rs
index 6d2a0995..d3d5e4f0 100644
--- a/bobbin/crates/xrpc/tests/aggregation.rs
+++ b/bobbin/crates/xrpc/tests/aggregation.rs
@@ -1312,10 +1312,10 @@ async fn feed_comment_endpoints_reject_bare_did_or_wrong_collection() {
                 let (status, body) = json_response(resp).await;
                 assert_eq!(status, StatusCode::BAD_REQUEST, "{endpoint} input={input}");
                 let msg = body["message"].as_str().unwrap_or_default();
-                assert!(
-                    msg.contains("sh.tangled.repo.issue") && msg.contains("sh.tangled.repo.pull"),
-                    "{endpoint} input={input}: {msg}",
-                );
+                 assert!(
+                     msg.contains("sh.tangled.repo.issue") && msg.contains("sh.tangled.repo.pull") && msg.contains("sh.tangled.string"),
+                     "{endpoint} input={input}: {msg}",
+                 );
             }
         })
         .await;