diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c47c72..20b484f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - `ipx add --list --category News <url>` puts a feed in the Directory for anyone to subscribe to,
-  and it stays there when its last subscriber leaves.
+  and it stays there when its last subscriber leaves. Run for a feed already in the catalogue,
+  it lists it or sets its category.
 - Feeds nobody subscribes to that are dead for a month or quiet for a year are removed, so the
   Directory lists feeds worth taking.
 
diff --git a/src/main.rs b/src/main.rs
index 140f0bc..13ff2ef 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -686,6 +686,19 @@ async fn add(
     let url = &feed::find_feed(&ctx.client, &feed::expand_input(url)).await?;
     // Includes feeds derived from an OPML, or the same show could be added twice.
     if let Some(existing) = subscriptions(ctx).await?.iter().find(|s| feed::same_feed(&s.cfg.url, url)) {
+        // Listing a feed the catalogue already has, or giving it a category, is the point of
+        // asking again: it changes those, and nothing else.
+        if let Some(f) = cfg.feeds.get_mut(&existing.id)
+            && (list || category.is_some())
+        {
+            f.listed |= list;
+            if category.is_some() {
+                f.category = category;
+            }
+            ctx.store_cfg(cfg).await?;
+            println!("{} is already in the catalogue; updated its Directory listing", existing.id);
+            return Ok(());
+        }
         anyhow::bail!("already subscribed as {:?}", existing.id);
     }
     let id = add_one(ctx, &mut cfg, url, folder, keywords).await?;