diff --git a/docs/.vitepress/theme/components/VocabQuiz.vue b/docs/.vitepress/theme/components/VocabQuiz.vue
index 2f0bcdd..f479180 100644
--- a/docs/.vitepress/theme/components/VocabQuiz.vue
+++ b/docs/.vitepress/theme/components/VocabQuiz.vue
@@ -1,7 +1,20 @@
 <template>
   <div>
     <nav v-if="v">
+      <Teleport to="body">
+        <div v-if="isEdit" :class="$style.modal" ref="modal">
+          <nav>
+            <span> ko: {{ v.ko }} </span>
+            <div style="flex-grow: 1"></div>
+            <button type="button" @click="onVContentSave()">Save</button>
+            <button type="button" @click="isEdit = false">×</button>
+          </nav>
+          <textarea v-model="vEditContent" spellcheck="false"></textarea>
+        </div>
+      </Teleport>
+
       <div :class="$style.mark">
+        <button type="button" name="edit" @click="isEdit = true">✎</button>
         <button type="button" name="right" @click="mark(true)">✓</button>
         <button
           type="button"
@@ -77,7 +90,15 @@
 
 <script setup lang="ts">
 import { useData } from "vitepress";
-import { computed, nextTick, ref, useTemplateRef, watch } from "vue";
+import {
+  computed,
+  nextTick,
+  onBeforeUnmount,
+  onMounted,
+  ref,
+  useTemplateRef,
+  watch,
+} from "vue";
 import SentenceAudio, { IVoc } from "./SentenceAudio.vue";
 
 const { fmKey = "vocabulary" } = defineProps<{
@@ -88,10 +109,15 @@ const vCats = ref<string[]>([]);
 const vChosenCats = ref<string[]>([]);
 const vList = ref<IVoc[]>([]);
 const vIndex = ref(-1);
+const exIndex = ref(0);
+
+const isEdit = ref(false);
+const vEditContent = ref("");
 
 const isAutoplayAudio = ref(true);
 const isKoFirst = ref(true);
 
+const modalRef = useTemplateRef("modal");
 const sentenceDetails = useTemplateRef("sdetails");
 const saud = useTemplateRef<InstanceType<typeof SentenceAudio>>("saud");
 const vaud = useTemplateRef<InstanceType<typeof SentenceAudio>>("vaud");
@@ -100,7 +126,7 @@ const v = computed(() => vList.value[vIndex.value]);
 const example = computed(() => {
   if (!v.value.examples?.length) return null;
   const ex = v.value.examples;
-  return ex[Math.floor(Math.random() * ex.length)];
+  return ex[exIndex.value];
 });
 
 const MAX_VOC = 5;
@@ -128,6 +154,15 @@ watch(isKoFirst, () => {
   makeVList();
 });
 
+watch(isEdit, () => {
+  if (isEdit.value) {
+    const { ko, ...vContent } = v.value;
+    vEditContent.value = JSON.stringify(vContent, null, 2);
+  } else {
+    vEditContent.value = "";
+  }
+});
+
 function makeVList() {
   nextTick(() => {
     if (sentenceDetails.value) {
@@ -146,6 +181,9 @@ function makeVList() {
   vIndex.value = Math.floor(
     Math.random() * Math.min(MAX_VOC, vList.value.length),
   );
+
+  const ex = v.value.examples;
+  exIndex.value = ex ? Math.floor(Math.random() * ex.length) : 0;
 }
 
 function mark(isRight: boolean) {
@@ -184,6 +222,9 @@ function mark(isRight: boolean) {
   } else {
     vIndex.value = i;
   }
+
+  const ex = v.value.examples;
+  exIndex.value = ex ? Math.floor(Math.random() * ex.length) : 0;
 }
 
 function updateCats(cat: string) {
@@ -196,6 +237,35 @@ function updateCats(cat: string) {
 
   makeVList();
 }
+
+function onVContentSave() {
+  const newV = { ko: v.value.ko, ...JSON.parse(vEditContent.value) };
+
+  const newVList = [...vList.value];
+  newVList[vIndex.value] = newV;
+  vList.value = newVList;
+
+  isEdit.value = false;
+}
+
+function onModalClickOutside(ev: MouseEvent) {
+  if (!(ev.target instanceof HTMLElement)) return;
+  if (ev.target.matches('[name="edit"]')) return;
+
+  if (!modalRef.value) {
+    isEdit.value = false;
+  } else if (!modalRef.value.contains(ev.target.parentNode)) {
+    isEdit.value = false;
+  }
+}
+
+onMounted(() => {
+  document.addEventListener("click", onModalClickOutside);
+});
+
+onBeforeUnmount(() => {
+  document.addEventListener("click", onModalClickOutside);
+});
 </script>
 
 <style module>
@@ -275,4 +345,36 @@ function updateCats(cat: string) {
     }
   }
 }
+
+.modal {
+  --margin-top: calc(120px + env(safe-area-inset-top));
+
+  position: absolute;
+  top: var(--margin-top);
+  left: 50%;
+  transform: translateX(-50%);
+  width: calc(100vw - 4em);
+  max-width: 1000px;
+
+  nav {
+    display: flex;
+    flex-direction: row;
+    background-color: rgba(128, 128, 128, 0.8);
+    padding: 0.5em;
+    border-radius: 0.5em 0.5em 0 0;
+
+    * + * {
+      margin-inline-start: 1em;
+    }
+  }
+
+  textarea {
+    width: 100%;
+    height: calc(90vh - var(--margin-top) - env(safe-area-inset-bottom));
+    padding: 1em;
+    border-radius: 0 0 0.5em 0.5em;
+    font-family: sans-serif;
+    resize: none;
+  }
+}
 </style>