diff --git a/booru_utils.py b/booru_utils.py
index aa240da..02b1e77 100644
--- a/booru_utils.py
+++ b/booru_utils.py
@@ -77,7 +77,7 @@ def create_post(
     }
 
     if description:
-        data["post[artist_commentary_desc]"] = description
+        data["post[artist_commentary][original_description]"] = description
 
     print(f"Posting upload ID {upload_id}, tags '{tags}', rating {rating}")
 
@@ -95,6 +95,41 @@ def create_post(
         print(f"Response: {response.text}")
 
 
+def find_pool_by_name(api_key, username, danbooru_url, pool_name):
+    """Find a pool by exact name. Returns pool dict (with id, post_ids, etc.) or None."""
+    url = f"{danbooru_url}/pools.json"
+    params = {
+        "search[name]": pool_name,
+        "limit": 1,
+        "login": username,
+        "api_key": api_key,
+    }
+    response = requests.get(url, params=params, auth=(username, api_key))
+    if response.status_code == 200:
+        pools = response.json()
+        if pools and not pools[0].get("is_deleted", False):
+            return pools[0]
+    return None
+
+
+def update_pool(api_key, username, danbooru_url, pool_id, pool_ids):
+    """Update an existing pool's post list (replaces with the given pool_ids)."""
+    url = f"{danbooru_url}/pools/{pool_id}.json?api_key={api_key}&login={username}"
+    data = {
+        "pool[category]": "series",
+        "pool[post_ids_string]": " ".join(str(_id) for _id in pool_ids),
+    }
+    print(f"Updating pool {pool_id} with {len(pool_ids)} posts")
+    response = requests.put(url, data=data)
+    if response.status_code == 200:
+        print(f"Updated pool {pool_id}.")
+    else:
+        print(
+            f"Failed to update pool {pool_id}. Status code: {response.status_code}"
+        )
+        print(f"Response: {response.text}")
+
+
 def create_pool(api_key, username, danbooru_url, pool_name, pool_ids):
     url = f"{danbooru_url}/pools.json?api_key={api_key}&login={username}"