diff --git a/README.md b/README.md
index ec11afb..20f66a1 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,9 @@
 # Mastodon Image Bot
 
-This is a small program that posts an image from `./posts` every time you call it. You can call it like so:
+This is a small program that posts an image from a given folder every time you call it. You can call it like so:
 
 ```
-MASTODON_INSTANCE_URL=... MASTODON_ACCESS_TOKEN=... deno run --allow-env --allow-net --allow-write --allow-read main.ts
+MASTODON_INSTANCE_URL=... MASTODON_ACCESS_TOKEN=... deno run --allow-env --allow-net --allow-write --allow-read main.ts [folder]
 ```
+
+If you leave out `folder` when calling the script, it will try to look for a `posts` directory inside the folder where the script is located.
diff --git a/main.ts b/main.ts
index 51e03ab..a2f0e42 100644
--- a/main.ts
+++ b/main.ts
@@ -1,3 +1,5 @@
+import * as path from 'https://deno.land/std@0.102.0/path/mod.ts';
+
 const MASTODON_INSTANCE_URL = Deno.env.get("MASTODON_INSTANCE_URL"); // e.g. https://botsin.space
 const MASTODON_ACCESS_TOKEN = Deno.env.get("MASTODON_ACCESS_TOKEN"); // you can get this at $INSTANCE_URL/settings/applications
 
@@ -33,17 +35,19 @@ const api = (
 
 // first we need to find out which files we can post, and which ones we already
 // have posted
+const scriptDir = path.dirname(path.fromFileUrl(Deno.mainModule))
+const imgDir = path.resolve(scriptDir, Deno.args[0] || 'posts')
 
 console.log("Picking file to post…");
 const alreadyPostedFiles = new Set();
-for await (const dirEntry of Deno.readDir("./posts/.posted")) {
+for await (const dirEntry of Deno.readDir(`${imgDir}/.posted`)) {
   if (dirEntry.isSymlink) {
     alreadyPostedFiles.add(dirEntry.name);
   }
 }
 
 const availableFiles = [];
-for await (const dirEntry of Deno.readDir("./posts/")) {
+for await (const dirEntry of Deno.readDir(imgDir)) {
   if (dirEntry.name === ".gitignore") continue;
 
   if (dirEntry.isFile && !alreadyPostedFiles.has(dirEntry.name)) {
@@ -60,7 +64,7 @@ if (availableFiles.length === 0) {
 
 const fileToPost =
   availableFiles[Math.floor(Math.random() * availableFiles.length)];
-const bytes = await Deno.readFile(`./posts/${fileToPost}`);
+const bytes = await Deno.readFile(`${imgDir}/${fileToPost}`);
 
 console.log(`Will post file ${fileToPost}`);
 
@@ -117,7 +121,8 @@ const { data: statusRequest } = await api("/api/v1/statuses", {
 console.log("statusRequest", statusRequest);
 
 console.log("Linking posted file so we can skip it in the future…");
-// FIXME: This requires unrestricted `--allow-read` and `--allow-write` at the;
+// FIXME: This requires unrestricted `--allow-read` and `--allow-write`;
 // deno should provide a finer-grained permission prompt here
-await Deno.symlink(`../${fileToPost}`, `./posts/.posted/${fileToPost}`);
+// see https://github.com/denoland/deno/issues/9607
+await Deno.symlink(`../${fileToPost}`, `${imgDir}/.posted/${fileToPost}`);
 console.log("Done!");