diff --git a/src/routes/index.py b/src/routes/index.py
index 84439b9..d925e8f 100644
--- a/src/routes/index.py
+++ b/src/routes/index.py
@@ -18,14 +18,17 @@ def index() -> str:
     )
 
 
-@router.route("/", methods=["POST"])
-def new_post() -> Response:
+@router.route("/", methods=["POST"], defaults={"post_id": None})
+@router.route("/<post_id>", methods=["POST"])
+def new_post(post_id: int | None) -> Response:
     """create a new post"""
     if Config.is_logged():
         content = request.form.get("p")
         if content:
-            # finding an appropriate filename
-            filename = fresh_file_id()
+            if post_id is None:
+                filename = fresh_file_id()
+            else:
+                filename = post_id
 
             # create/update the post
             update = create_post(filename, content)
diff --git a/src/routes/read.py b/src/routes/read.py
index 33afafc..05bf247 100644
--- a/src/routes/read.py
+++ b/src/routes/read.py
@@ -1,6 +1,6 @@
 from config import Config
 from flask import Blueprint, flash, redirect, render_template
-from utils.misc import delete_post, get_post, post_filename
+from utils.misc import delete_post, get_post, post_filename, post_file_id
 from werkzeug import Response
 
 name = __name__.split(".")[-1]
@@ -20,6 +20,7 @@ def read(file: int) -> str:
         page_name=name,
         name=f"{file}.txt",
         file=content,
+        post_file_id=post_file_id,
     )
 
 
diff --git a/src/templates/post.html b/src/templates/post.html
index bdc9ddf..29d69c4 100644
--- a/src/templates/post.html
+++ b/src/templates/post.html
@@ -1,5 +1,5 @@
 {% if config.is_logged() %}
-<form action="/" method="post">
+<form action="/{% if name %}{{ post_file_id(name) }}{% endif %}" method="post">
   <textarea name="p">{{ file }}</textarea>
   <br />
   <button type="submit">send</button>
diff --git a/src/utils/misc.py b/src/utils/misc.py
index af8c54a..d0c596e 100644
--- a/src/utils/misc.py
+++ b/src/utils/misc.py
@@ -10,6 +10,11 @@ def post_filename(number: int) -> str:
     return f"{Config.data_dir}/{number}.txt"
 
 
+def post_file_id(filename: str) -> int:
+    """extract the id from the filename"""
+    return int(filename.split("/")[-1][:-4])
+
+
 def get_posts() -> list[str]:
     """get posts list"""
     return [
@@ -49,7 +54,7 @@ def fresh_file_id() -> int:
         chosen = max(iter(paths), key=os_path.getmtime)
 
         # add 1 to the chosen id
-        filename = int(chosen.split("/")[-1][:-4]) + 1
+        filename = post_file_id(chosen) + 1
     return filename