diff --git a/README.md b/README.md
index a1516c8..8763f16 100644
--- a/README.md
+++ b/README.md
@@ -38,17 +38,18 @@ slug tail follows. Nothing else is touched.
 ## How it works
 
 - A note is a zettel when its filename starts with a **TIMEID**: a run of 12 to 18 digits
-  (a timestamp), for example `20260728145404-my-note.md`. Files without that prefix are
-  ignored, so plain notes, daily notes, Excalidraw and Kanban files are never renamed.
+  (a timestamp) followed by any non-digit or the end of the name - so `20260728145404-my-note.md`,
+  `202607281454.md`, and even `202607281454 my note.md` all qualify. Files without that prefix
+  are ignored, so plain notes, daily notes, Excalidraw and Kanban files are never renamed.
 - The TIMEID is minted **once** and never changes. Only the slug tail is regenerated.
-- When you edit the H1, zettelclean waits about 5 seconds of idle, then renames the file to
-  `TIMEID-slug(H1).md` using Obsidian's own rename (so backlinks are updated). A 10 second
+- When you edit the H1, zettelclean waits about 4 seconds of idle, then renames the file to
+  `TIMEID-slug(H1).md` using Obsidian's own rename (so backlinks are updated). A 6 second
   cooldown prevents a just-renamed file from being renamed again.
 - Sync is strictly one-way, H1 to filename. Renaming a file by hand is never fought.
 - Delete the H1 and the filename collapses back to the bare `TIMEID.md`.
 
-The slug is lowercase, ASCII, dash-separated: accents are folded (`Ciências` becomes
-`ciencias`), runs of punctuation and whitespace collapse to a single dash, and leading and
+The slug is case-preserving, ASCII, dash-separated: accents are folded (`Ciências` becomes
+`Ciencias`), runs of punctuation and whitespace collapse to a single dash, and leading and
 trailing dashes are trimmed.
 
 ## Creating notes
@@ -70,6 +71,13 @@ Notes created before you adopted this workflow have no TIMEID. Right-click such
 file explorer and choose **"Prefix timestamp to filename"**. It mints a fresh timestamp,
 prepends it, and the note is now a zettel that syncs on future H1 edits.
 
+## Slugging a folder name
+
+Right-click a folder and choose **"Slug folder name"** to ASCII-clean it in place (this folder
+only): `Citações` becomes `Citacoes`. The rename goes through Obsidian, so `[[links]]` into the
+folder are updated. It aborts if a sibling of that name already exists, and never touches the
+vault root.
+
 ## Pretty sidebar (optional)
 
 By default the file explorer shows the slugged filename (with dashes). If you want the sidebar,
@@ -84,7 +92,7 @@ That reads the first H1 directly and falls back to the filename when there is no
 
 ## Settings
 
-None. Zettelclean is zero-config in this version. The 5 second settle and 10 second cooldown
+None. Zettelclean is zero-config in this version. The 4 second settle and 6 second cooldown
 are fixed.
 
 ## Development
diff --git a/VERSION b/VERSION
index 5aff5a0..22c692f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-zettelclean v0.4
+zettelclean v0.5
diff --git a/manifest.json b/manifest.json
index 40c4f3b..b68adbf 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,7 +1,7 @@
 {
 	"id": "zettelclean",
 	"name": "Zettelclean",
-	"version": "0.4.0",
+	"version": "0.5.0",
 	"minAppVersion": "1.0.0",
 	"description": "Keep a Zettelkasten filename's slug in sync with the note's H1 heading.",
 	"author": "Ruben Carlo Benante",
diff --git a/package.json b/package.json
index 0d0e167..3de19b7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "zettelclean",
-	"version": "0.4.0",
+	"version": "0.5.0",
 	"description": "Keep a Zettelkasten filename's slug in sync with the note's H1 heading.",
 	"author": "Ruben Carlo Benante <rcb@beco.cc>",
 	"main": "main.js",
diff --git a/src/main.ts b/src/main.ts
index 0bd3259..a826ac2 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -19,11 +19,19 @@
 // *  rcb@beco.cc                                                          *
 // *************************************************************************
 
-import { Plugin, TFile, TAbstractFile, Menu, moment } from 'obsidian';
+import {
+	Plugin,
+	TFile,
+	TAbstractFile,
+	TFolder,
+	Menu,
+	Notice,
+	moment,
+} from 'obsidian';
 import { extractTimeId, generateSlug, buildFilename } from './slug';
 
-const SETTLE_MS = 5000; // rename ~5s after the H1 stops changing
-const COOLDOWN_MS = 10000; // do not rename the same path again within 10s
+const SETTLE_MS = 4000; // rename ~4s after the H1 stops changing
+const COOLDOWN_MS = 6000; // do not rename the same path again within 6s
 
 export default class ZettelcleanPlugin extends Plugin {
 	private renameTimers = new Map<string, number>();
@@ -37,11 +45,12 @@ export default class ZettelcleanPlugin extends Plugin {
 				this.scheduleSync(file),
 			),
 		);
-		// Retrofit entry in the file-explorer right-click menu, near "Rename".
+		// File-explorer right-click menu: retrofit item for files, slug item for folders.
 		this.registerEvent(
-			this.app.workspace.on('file-menu', (menu, file) =>
-				this.addTimeIdMenu(menu, file),
-			),
+			this.app.workspace.on('file-menu', (menu, file) => {
+				this.addTimeIdMenu(menu, file);
+				this.addFolderSlugMenu(menu, file);
+			}),
 		);
 	}
 
@@ -56,8 +65,8 @@ export default class ZettelcleanPlugin extends Plugin {
 		return `${dir}${base}.md`;
 	}
 
-	// Guard layer: only the actively edited zettel, honoring the 10s cooldown,
-	// (re)arming the 5s settle timer on every cache change.
+	// Guard layer: only the actively edited zettel, honoring the 6s cooldown,
+	// (re)arming the 4s settle timer on every cache change.
 	private scheduleSync(file: TAbstractFile) {
 		if (this.isRenameInProgress) return; // our own rename, ignore
 		if (!(file instanceof TFile) || file.extension !== 'md') return;
@@ -65,7 +74,7 @@ export default class ZettelcleanPlugin extends Plugin {
 		if (this.app.workspace.getActiveFile() !== file) return; // only the edited note
 
 		const last = this.lastRenamedAt.get(file.path);
-		if (last && Date.now() - last < COOLDOWN_MS) return; // 10s cooldown
+		if (last && Date.now() - last < COOLDOWN_MS) return; // 6s cooldown
 
 		const existing = this.renameTimers.get(file.path);
 		if (existing) window.clearTimeout(existing);
@@ -128,4 +137,32 @@ export default class ZettelcleanPlugin extends Plugin {
 		}
 		await this.app.fileManager.renameFile(file, target);
 	}
+
+	// Folder right-click: slug the folder's own name (this folder only, instant).
+	private addFolderSlugMenu(menu: Menu, file: TAbstractFile) {
+		if (!(file instanceof TFolder) || file.isRoot()) return; // never the vault root
+		menu.addItem((item) =>
+			item
+				.setTitle('Slug folder name')
+				.setIcon('folder')
+				.onClick(() => void this.slugFolder(file)),
+		);
+	}
+
+	private async slugFolder(folder: TFolder) {
+		const newName = generateSlug(folder.name);
+		if (!newName || newName === folder.name) {
+			new Notice('Folder name is already clean');
+			return;
+		}
+		const parent = folder.parent;
+		const dir = parent && parent.path !== '/' ? `${parent.path}/` : '';
+		const newPath = `${dir}${newName}`; // folders have no extension
+		if (this.app.vault.getAbstractFileByPath(newPath)) {
+			new Notice(`Cannot rename: "${newName}" already exists`);
+			return;
+		}
+		await this.app.fileManager.renameFile(folder, newPath); // updates [[links]]
+		new Notice(`Renamed folder "${folder.name}" -> "${newName}"`);
+	}
 }
diff --git a/src/slug.test.ts b/src/slug.test.ts
index a7d458d..cb197cb 100644
--- a/src/slug.test.ts
+++ b/src/slug.test.ts
@@ -23,15 +23,16 @@ import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { extractTimeId, generateSlug, buildFilename } from './slug.ts';
 
-test('slug folds accents, lowercases, collapses', () => {
+test('slug folds accents and collapses, preserving case', () => {
 	assert.equal(
 		generateSlug('Ciências Políticas - Visão Geral'),
-		'ciencias-politicas-visao-geral',
+		'Ciencias-Politicas-Visao-Geral',
 	);
+	assert.equal(generateSlug('Citações'), 'Citacoes');
 });
 
 test('slug collapses runs of punctuation and whitespace to one dash', () => {
-	assert.equal(generateSlug('  Hello,   World!!  '), 'hello-world');
+	assert.equal(generateSlug('  Hello,   World!!  '), 'Hello-World');
 	assert.equal(generateSlug('a/b:c*d?e'), 'a-b-c-d-e');
 });
 
@@ -40,11 +41,13 @@ test('empty or heading-less input yields empty slug', () => {
 	assert.equal(generateSlug('   ---   '), '');
 });
 
-test('extractTimeId accepts 12/14/18-digit prefixes, rejects others', () => {
-	assert.equal(extractTimeId('202607281454-x'), '202607281454'); // 12
+test('extractTimeId accepts 12/14/18-digit prefixes and a non-dash boundary', () => {
+	assert.equal(extractTimeId('202607281454-x'), '202607281454'); // 12, dash
 	assert.equal(extractTimeId('20260728145404-x'), '20260728145404'); // 14
 	assert.equal(extractTimeId('202607281454049999-x'), '202607281454049999'); // 18
 	assert.equal(extractTimeId('20260728145404'), '20260728145404'); // bare id
+	assert.equal(extractTimeId('202607290947 test pkm'), '202607290947'); // space
+	assert.equal(extractTimeId('202607290947test'), '202607290947'); // letters
 	assert.equal(extractTimeId('my-note'), null);
 	assert.equal(extractTimeId('2026-budget'), null); // too short
 	assert.equal(extractTimeId('2026072814540499999-x'), null); // 19, too long
diff --git a/src/slug.ts b/src/slug.ts
index 434c0b2..5312ac7 100644
--- a/src/slug.ts
+++ b/src/slug.ts
@@ -23,9 +23,10 @@
 // in isolation. The transform is always one-way (H1 -> filename), which lets us
 // freely drop characters without worrying about a reverse mapping.
 
-// A TIMEID is a leading run of 12 to 18 digits, ending at a dash or end-of-name.
+// A TIMEID is the leading run of 12 to 18 digits, ending at any non-digit or
+// end-of-name (so "202607290947 test" and "202607290947-slug" both qualify).
 // 12-18 because collision-avoidance may append extra digits to a 14-digit stamp.
-const TIMEID_RE = /^(\d{12,18})(?=-|$)/;
+const TIMEID_RE = /^(\d{12,18})(?=\D|$)/;
 
 // Return the immutable id prefix, or null if this file is not a zettel.
 export function extractTimeId(basename: string): string | null {
@@ -33,13 +34,13 @@ export function extractTimeId(basename: string): string | null {
 	return m?.[1] ?? null;
 }
 
-// H1 text -> kebab slug. sanifize as inspiration, deliberately simpler.
-export function generateSlug(heading: string): string {
-	return heading
+// text (an H1 or a folder name) -> ASCII, case-preserving, dash-separated slug.
+// Shared by the file-rename sync and the folder-slug menu.
+export function generateSlug(text: string): string {
+	return text
 		.normalize('NFKD') // split accented letters into base + combining mark
 		.replace(/[̀-ͯ]/g, '') // strip the combining marks (c-cedilla -> c)
-		.toLowerCase()
-		.replace(/[^a-z0-9]+/g, '-') // any run of non-alphanumerics -> one dash
+		.replace(/[^a-zA-Z0-9]+/g, '-') // non-alphanumerics -> one dash (case kept)
 		.replace(/^-+|-+$/g, ''); // trim leading/trailing dashes
 }
 
diff --git a/versions.json b/versions.json
index dbc2cea..a70ceb3 100644
--- a/versions.json
+++ b/versions.json
@@ -1,3 +1,3 @@
 {
-	"0.4.0": "1.0.0"
+	"0.5.0": "1.0.0"
 }