diff --git a/packages/client/src/components/mfm.ts b/packages/client/src/components/mfm.ts
index 2c8b3e3ed..e2b8823f7 100644
--- a/packages/client/src/components/mfm.ts
+++ b/packages/client/src/components/mfm.ts
@@ -212,6 +212,16 @@ export default defineComponent({
 							style = `background-color: #${color};`;
 							break;
 						}
+						case 'small': {
+							return h('small', {
+								class: '_mfm_small_'
+							}, genEl(token.children));
+						}
+						case 'center': {
+							return h('div', {
+								style: 'text-align:center;',
+							}, genEl(token.children));
+						}
 					}
 					if (style == null) {
 						return h('span', {}, ['$[', token.props.name, ' ', ...genEl(token.children), ']']);
diff --git a/packages/client/src/scripts/mfm-tags.ts b/packages/client/src/scripts/mfm-tags.ts
index 84415f400..604380fc0 100644
--- a/packages/client/src/scripts/mfm-tags.ts
+++ b/packages/client/src/scripts/mfm-tags.ts
@@ -1 +1 @@
-export const MFM_TAGS = ['tada', 'jelly', 'twitch', 'shake', 'spin', 'jump', 'bounce', 'flip', 'x2', 'x3', 'x4', 'font', 'blur', 'rainbow', 'sparkle', 'rotate', 'position', 'scale', 'fg', 'bg'];
+export const MFM_TAGS = ['tada', 'jelly', 'twitch', 'shake', 'spin', 'jump', 'bounce', 'flip', 'x2', 'x3', 'x4', 'font', 'blur', 'rainbow', 'sparkle', 'rotate', 'position', 'scale', 'fg', 'bg', 'small', 'center'];