diff --git a/src/index.html b/src/index.html
index b4ab5d0..1e18769 100644
--- a/src/index.html
+++ b/src/index.html
@@ -43,7 +43,7 @@
 				<div class="title text-center">Addons</div>
 				<button id="close-sources" data-tooltip="Close"><i class="fa-solid fa-times"></i></button>
 				<div class="horizontal vcenter-items">
-					<input type="url" id="source-url" placeholder="Piece list URL">
+					<input type="url" id="source-url" placeholder="Piece list URL / addon">
 					<button id="add-source" data-tooltip="Add source"><i class="fa-solid fa-plus"></i></button>
 				</div>
 				<div class="sources-list" id="source-list"></div>
diff --git a/src/main.mjs b/src/main.mjs
index acfe3f3..868bcb2 100644
--- a/src/main.mjs
+++ b/src/main.mjs
@@ -37,9 +37,22 @@ export let pieces = {};
 export let pieceSources = {};
 import { spellToSnbt } from 'psi-spell-encode-wasm';
 const builtinSources = ['psi'].reduce((obj, list) => (obj[list] = 'pieces/' + list + '.html', obj), {});
+const addonSources = { ...builtinSources, ...['phi'].reduce((obj, list) => (obj[list] = 'pieces/' + list + '.html', obj), {}) };
 const loads = Promise.all([init(wasmUrl), ...Object.values(builtinSources)
 	.map(url => addPieceSource(url, true))]);
 
+{
+	let list = document.createElement('datalist');
+	sourceURL.parentNode.appendChild(list);
+	list.id = 'addon-sources';
+	sourceURL.setAttribute('list', list.id);
+	for (let source of Object.keys(addonSources)) {
+		let option = document.createElement('option');
+		option.value = source;
+		list.appendChild(option);
+	}
+}
+
 parseURLArgs(loads);
 
 async function loadPieceDesc(url) {
@@ -57,6 +70,7 @@ sourceURL.addEventListener('keydown', e => {
 });
 
 export async function addPieceSource(url, builtin = false, urlArg = false) {
+	if (addonSources[url]) url = addonSources[url];
 	let pieces = await loadPieceDesc(url);
 	if (pieceSources[pieces.namespace]) removePieceSource(pieces.namespace, true, urlArg);
 	let item = sourceList.div('source-item', 'horizontal', 'vcenter-items', ...builtin ? ['builtin'] : []);
@@ -88,6 +102,7 @@ export async function addPieceSource(url, builtin = false, urlArg = false) {
 	};
 	reorderSources();
 	rebuildCatalog();
+	// TODO rebuild grid
 }
 
 function reorderSources() {
@@ -107,6 +122,7 @@ function removePieceSource(namespace, replacing = false, urlArg = false) {
 		addPieceSource(builtinSources[namespace], true, urlArg);
 	}
 	rebuildCatalog();
+	// TODO rebuild grid
 }
 
 function rebuildCatalog() {
diff --git a/src/piece.mjs b/src/piece.mjs
index cabed5d..97b579c 100644
--- a/src/piece.mjs
+++ b/src/piece.mjs
@@ -200,6 +200,7 @@ export async function loadPieces(html) {
 		e.dataset.key = e.dataset.key || `${namespace}:${e.dataset.type}`;
 		e.dataset.sortingName = e.dataset.sortingName || e.dataset.name;
 		e.dataset.tooltip = e.dataset.name + '\n' + e.dataset.desc;
+		if (namespace != 'psi') e.dataset.tooltip += `\nAddon: ${namespace}`;
 		pieces[e.dataset.key] = e;
 	});
 	return {