diff --git i/git-branchless-submit/src/github.rs w/git-branchless-submit/src/github.rs
index 2e8abbb..9973f5a 100644
--- i/git-branchless-submit/src/github.rs
+++ w/git-branchless-submit/src/github.rs
@@ -523,7 +523,6 @@ fn make_updated_pull_request_info(
         pull_request_infos: &HashMap<String, client::PullRequestInfo>,
         commit_oid: NonZeroOid,
     ) -> EyreExitOr<client::UpdatePullRequestArgs> {
-        let mut stack_index = None;
         let mut stack_pull_request_infos: IndexMap<NonZeroOid, &client::PullRequestInfo> =
             Default::default();
 
@@ -612,9 +611,6 @@ fn make_updated_pull_request_info(
                 None => continue,
             };
             stack_pull_request_infos.insert(stack_commit_oid, pull_request_info);
-            if stack_commit_oid == commit_oid {
-                stack_index = Some(stack_pull_request_infos.len());
-            }
         }
 
         let stack_size = stack_pull_request_infos.len();
@@ -625,17 +621,6 @@ fn make_updated_pull_request_info(
                 "No pull requests in stack for commit"
             );
         }
-        let stack_index = match stack_index {
-            Some(stack_index) => stack_index.to_string(),
-            None => {
-                warn!(
-                    ?commit_oid,
-                    ?stack_pull_request_infos,
-                    "Could not determine index in stack for commit"
-                );
-                "?".to_string()
-            }
-        };
 
         let stack_list = {
             let mut result = String::new();
@@ -650,7 +635,7 @@ fn make_updated_pull_request_info(
         let commit = self.repo.find_commit_or_fail(commit_oid)?;
         let commit_summary = commit.get_summary()?;
         let commit_summary = String::from_utf8_lossy(&commit_summary).into_owned();
-        let title = format!("[{stack_index}/{stack_size}] {commit_summary}");
+        let title = commit_summary;
         let commit_message = commit.get_message_pretty();
         let commit_message = String::from_utf8_lossy(&commit_message);
         let body = format!(