diff --git a/src/main.ts b/src/main.ts
index 02d5601..7b4505d 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -10,6 +10,7 @@ export default class FolderNotesPlugin extends Plugin {
 	observer: MutationObserver;
 	settings: FolderNotesSettings;
 	settingsTab: SettingsTab;
+	activeFolderDom: HTMLElement | null;
 	activeFileExplorer: FileExplorerWorkspaceLeaf;
 
 	async onload() {
@@ -68,6 +69,17 @@ export default class FolderNotesPlugin extends Plugin {
 
 		}));
 
+		this.registerEvent(this.app.workspace.on('file-open', (openFile: TFile | null) => {
+			if(this.activeFolderDom) {
+				this.activeFolderDom.removeClass('is-active');
+				this.activeFolderDom = null;
+			}
+			if(!openFile || !openFile.basename) { return; }
+			if(openFile.basename !== openFile.parent.name) { return; }
+			this.activeFolderDom = this.getEL(openFile.parent.path);
+			if(this.activeFolderDom) this.activeFolderDom.addClass('is-active');
+		}));
+
 		this.registerEvent(this.app.vault.on('rename', (file: TAbstractFile, oldPath: string) => {
 			if (!this.settings.syncFolderName) {
 				// cleanup after ourselves
@@ -326,6 +338,7 @@ export default class FolderNotesPlugin extends Plugin {
 		document.body.classList.remove('folder-note-underline');
 		document.body.classList.remove('hide-folder-note');
 		document.body.classList.remove('fn-whitespace-stop-collapsing');
+		if(this.activeFolderDom) { this.activeFolderDom.removeClass('is-active'); }
 	}
 
 	async loadSettings() {