diff --git a/PR.md b/PR.md
new file mode 100644
index 00000000..5213be6a
--- /dev/null
+++ b/PR.md
@@ -0,0 +1,32 @@
+# fix/project-card-refresh
+
+## Refresh project cards after subtask edits
+
+Project cards now refresh immediately when subtasks are added or removed via the edit modal. This ensures the project indicator and subtask list update without requiring a manual reload.
+
+Examples (illustrative):
+
+- Assigning subtasks to a task now turns it into a project card right after Save.
+- Removing the last subtask now returns the card to a normal task immediately.
+
+## Changelog
+
+- Invalidate the project index after subtask edits in the task edit modal.
+- Emit a task-updated event for the parent task to refresh visible views.
+
+## Risks / Notes
+
+- This is a minimal fix and does not address the broader, system-wide refresh architecture. A more robust approach is under discussion in: https://github.com/callumalpass/tasknotes/issues/1423
+- The project index invalidation is global, which can be more expensive in large vaults. This is an intentional trade-off for immediate correctness.
+
+## Tests
+
+- `npm run i18n:sync`
+- `npm run lint` (warnings only; matches `upstream/main`)
+- `node generate-release-notes-import.mjs`
+- `npm run typecheck`
+- `npm run test:ci -- --verbose` (fails in `upstream/main`: `tests/unit/issues/due-date-timezone-inconsistency.test.ts`)
+- `npm run test:integration`
+- `npm run test:performance` (no tests found)
+- `npm run build` (missing OAuth IDs: `GOOGLE_OAUTH_CLIENT_ID`, `MICROSOFT_OAUTH_CLIENT_ID`)
+- `npm run test:build`
diff --git a/src/modals/TaskEditModal.ts b/src/modals/TaskEditModal.ts
index a0252dd5..ccc11657 100644
--- a/src/modals/TaskEditModal.ts
+++ b/src/modals/TaskEditModal.ts
@@ -2,7 +2,7 @@
 import { App, Notice, TFile, TAbstractFile, setIcon, setTooltip } from "obsidian";
 import TaskNotesPlugin from "../main";
 import { TaskModal } from "./TaskModal";
-import { TaskDependency, TaskInfo } from "../types";
+import { TaskDependency, TaskInfo, EVENT_TASK_UPDATED } from "../types";
 import {
 	getCurrentTimestamp,
 	formatDateForStorage,
@@ -691,6 +691,15 @@ export class TaskEditModal extends TaskModal {
 
 			if (hasSubtaskChanges) {
 				await this.applySubtaskChanges(updatedTask);
+				this.plugin.projectSubtasksService?.invalidateProjectIndex();
+				if (!hasTaskChanges) {
+					this.plugin.emitter.trigger(EVENT_TASK_UPDATED, {
+						path: updatedTask.path,
+						task: updatedTask,
+						taskInfo: updatedTask,
+						updatedTask,
+					});
+				}
 			}
 
 			if (this.unresolvedBlockingEntries.length > 0) {
diff --git a/src/services/ProjectSubtasksService.ts b/src/services/ProjectSubtasksService.ts
index f1ca1bc2..21f83c01 100644
--- a/src/services/ProjectSubtasksService.ts
+++ b/src/services/ProjectSubtasksService.ts
@@ -238,6 +238,14 @@ export class ProjectSubtasksService {
 		}
 	}
 
+	/**
+	 * Mark the project index as stale so it rebuilds on next access.
+	 */
+	invalidateProjectIndex(): void {
+		this.projectIndex.clear();
+		this.indexLastBuilt = 0;
+	}
+
 	/**
 	 * Cleanup when service is destroyed
 	 */