diff --git a/plugins/tiddlypwa/filters.js b/plugins/tiddlypwa/filters.js
new file mode 100644
index 0000000..e8384f4
--- /dev/null
+++ b/plugins/tiddlypwa/filters.js
@@ -0,0 +1,36 @@
+/*\
+title: $:/plugins/valpackett/tiddlypwa/filters.js
+type: application/javascript
+module-type: isfilteroperator
+
+Filter function for TiddlyPWA-managed tiddler identification
+
+Licensed under 0BSD, see license.tid.
+Formatted with `deno fmt`.
+\*/
+
+'use strict';
+
+exports.tiddlypwa = function (source, prefix, options) {
+	const results = [];
+
+	const pwaStorage = $tw.syncer.syncadaptor;
+	if (!pwaStorage || !pwaStorage.tiddlersInFile) {
+		return ['Error: TiddlyPWA not available'];
+	}
+
+	if (prefix === '!') {
+		source(function (tiddler, title) {
+			if (pwaStorage.tiddlersInFile.has(title)) {
+				results.push(title);
+			}
+		});
+	} else {
+		source(function (tiddler, title) {
+			if (!pwaStorage.tiddlersInFile.has(title)) {
+				results.push(title);
+			}
+		});
+	}
+	return results;
+};
diff --git a/plugins/tiddlypwa/filters.tid b/plugins/tiddlypwa/filters.tid
new file mode 100644
index 0000000..824f315
--- /dev/null
+++ b/plugins/tiddlypwa/filters.tid
@@ -0,0 +1,11 @@
+title: $:/plugins/valpackett/tiddlypwa/filters
+
+!!! Filter Operators
+
+TiddlyPWA provides filter operator to identify tiddlers it manages:
+
+* `[is[tiddlypwa]]` - tiddlers created/loaded by TiddlyPWA (from local DB or server)
+* `[!is[tiddlypwa]]` - inversion of the above, i.e. tiddlers loaded from app wiki html file
+
+This may be useful to find system tiddlers created by you, or to check shadow tiddler origins
+(app file vs DB/server) or when exporting (to e.g. backup everything stored on server including system tiddlers).
\ No newline at end of file
diff --git a/plugins/tiddlypwa/plugin.info b/plugins/tiddlypwa/plugin.info
index f4ab32b..bdcc8e8 100644
--- a/plugins/tiddlypwa/plugin.info
+++ b/plugins/tiddlypwa/plugin.info
@@ -5,7 +5,7 @@
 	"author": "Val Packett",
 	"version": "0.2.2",
 	"core-version": ">=5.2.0",
-	"list": "readme license",
+	"list": "readme filters license",
 	"source": "https://codeberg.org/valpackett/tiddlypwa",
 	"demo": "https://tiddly.packett.cool/",
 	"plugin-type": "plugin"
diff --git a/plugins/tiddlypwa/readme.tid b/plugins/tiddlypwa/readme.tid
index 4a77793..0aedf59 100644
--- a/plugins/tiddlypwa/readme.tid
+++ b/plugins/tiddlypwa/readme.tid
@@ -16,3 +16,5 @@ please do [[throw some monies her way|https://www.patreon.com/valpackett]] :3
 <$action-navigate $to="$:/ControlPanel"/>
 Configure the plugin in the Control Panel
 </$button>
+
+See ''filters'' tab for filter operators.
\ No newline at end of file