diff --git a/quickpeep/src/bin/qp-seedcoll-dump.rs b/quickpeep/src/bin/qp-seedcoll-dump.rs
index 21e5942..4786628 100644
--- a/quickpeep/src/bin/qp-seedcoll-dump.rs
+++ b/quickpeep/src/bin/qp-seedcoll-dump.rs
@@ -1,14 +1,15 @@
 use anyhow::{bail, Context};
 use env_logger::Env;
 use futures_util::stream::StreamExt;
+use itertools::Itertools;
 use quickpeep::config::WebConfig;
 use smartstring::alias::CompactString;
 use sqlx::sqlite::SqlitePoolOptions;
 use sqlx::{Connection, SqlitePool};
 use std::collections::{BTreeSet, HashMap};
+use std::fs::OpenOptions;
+use std::io::{BufWriter, Write};
 use std::path::{Path, PathBuf};
-use tokio::fs::OpenOptions;
-use tokio::io::{AsyncWriteExt, BufWriter};
 
 pub const DECISION_INCLUDED: i64 = 0;
 
@@ -94,7 +95,7 @@ pub async fn seed_dump(pool: &SqlitePool, path: &Path) -> anyhow::Result<()> {
     .fetch_optional(&mut *txn)
     .await?;
 
-    let file = OpenOptions::new().create_new(true).open(path).await?;
+    let file = OpenOptions::new().create_new(true).write(true).open(path)?;
 
     let mut last_processed_position: Option<i64> = None;
 
@@ -108,8 +109,8 @@ pub async fn seed_dump(pool: &SqlitePool, path: &Path) -> anyhow::Result<()> {
         WHERE collected_seed_id > ? AND decision = ?
         ORDER BY collected_seed_id ASC
     ",
+        process_from,
         DECISION_INCLUDED,
-        process_from
     )
     .fetch(&mut *txn);
 
@@ -122,7 +123,7 @@ pub async fn seed_dump(pool: &SqlitePool, path: &Path) -> anyhow::Result<()> {
 
         let mut tags: BTreeSet<&str> = row.tags.split(",").collect();
         let diff_tags: Vec<&str> = row.tag_diff.split(",").collect();
-        for diff_tag in diff_tags {
+        for diff_tag in diff_tags.into_iter().filter(|s| !s.is_empty()) {
             if diff_tag.starts_with('+') {
                 tags.insert(&diff_tag[1..]);
             } else if diff_tag.starts_with('-') {
@@ -146,17 +147,30 @@ pub async fn seed_dump(pool: &SqlitePool, path: &Path) -> anyhow::Result<()> {
 
     let mut buf_writer = BufWriter::new(file);
 
-    buf_writer.flush().await?;
+    for (tags, seeds) in seed_sets_to_seeds {
+        writeln!(buf_writer, "{}:", tags.iter().join(", "))?;
+        for seed in seeds {
+            if !seed.comment.is_empty() {
+                writeln!(buf_writer, "# {}", seed.comment.replace('\n', "\n# "))?;
+            }
+            writeln!(buf_writer, "{}", seed.url)?;
+        }
+        writeln!(buf_writer)?;
+    }
 
-    sqlx::query!(
-        "
-        REPLACE INTO seed_processing_positions (name, last_processed)
-        VALUES ('dumped', ?)
-    ",
-        last_processed_position
-    )
-    .execute(&mut *txn)
-    .await?;
+    buf_writer.flush()?;
+
+    if let Some(last_processed) = last_processed_position {
+        sqlx::query!(
+            "
+            REPLACE INTO seed_processing_positions (name, last_processed)
+            VALUES ('dumped', ?)
+        ",
+            last_processed
+        )
+        .execute(&mut *txn)
+        .await?;
+    }
 
     txn.commit().await?;
     Ok(())