diff --git a/app/Controllers/Api/EntryApiController.php b/app/Controllers/Api/EntryApiController.php
index d17d358..b8971a1 100644
--- a/app/Controllers/Api/EntryApiController.php
+++ b/app/Controllers/Api/EntryApiController.php
@@ -98,6 +98,7 @@ class EntryApiController extends BaseController
             foreach ($tests as $testData) {
                 $testId = $testData['testId'] ?? 0;
                 $resvalues = $testData['resvalue'] ?? [];
+                $rescomments = $testData['rescomment'] ?? [];
 
                 $controlTest = $this->controlTestModel->getByControlAndTest($controlId, $testId);
                 $mean = $controlTest['mean'] ?? 0;
@@ -111,12 +112,15 @@ class EntryApiController extends BaseController
 
                 foreach ($resvalues as $day => $value) {
                     if (!empty($value)) {
+                        $resdate = $yearMonth . '-' . str_pad($day, 2, '0', STR_PAD_LEFT);
+                        $rescomment = $rescomments[$day] ?? '';
+
                         $resultData = [
                             'control_ref_id' => $controlId,
                             'test_ref_id' => $testId,
-                            'resdate' => $yearMonth . '-' . str_pad($day, 2, '0', STR_PAD_LEFT),
+                            'resdate' => $resdate,
                             'resvalue' => $value,
-                            'rescomment' => '',
+                            'rescomment' => $rescomment,
                         ];
 
                         if ($operation === 'replace') {
@@ -223,9 +227,13 @@ class EntryApiController extends BaseController
             $comment = $this->commentModel->getByControlTestMonth($controlId, $testId, $yearMonth);
 
             $formValues = [];
+            $comments = [];
             foreach ($results as $row) {
                 $day = (int)date('j', strtotime($row['resdate']));
                 $formValues[$day] = $row['resvalue'];
+                if (!empty($row['rescomment'])) {
+                    $comments[$day] = $row['rescomment'];
+                }
             }
 
             return $this->respond([
@@ -233,6 +241,7 @@ class EntryApiController extends BaseController
                 'message' => 'fetch success',
                 'data' => [
                     'formValues' => $formValues,
+                    'comments' => $comments,
                     'comment' => $comment ? $comment['comtext'] : ''
                 ]
             ], 200);
diff --git a/app/Views/entry/monthly.php b/app/Views/entry/monthly.php
index c42cafa..e2d2b56 100644
--- a/app/Views/entry/monthly.php
+++ b/app/Views/entry/monthly.php
@@ -108,15 +108,38 @@
                                             <span x-text="getTestName(testId)"></span>
                                         </td>
                                         <template x-for="day in daysInMonth" :key="day">
-                                            <td class="py-1 px-1" :class="isWeekend(day) ? 'bg-red-50' : ''">
-                                                <input
-                                                    type="number"
-                                                    step="0.01"
-                                                    class="w-full px-2 py-1.5 text-center text-sm bg-white border border-slate-200 rounded focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500"
-                                                    :placeholder="'-'"
-                                                    x-model="monthlyData[testId + '_" + day + "']"
-                                                    @change="markDirty(testId, day)"
+                                            <td class="py-1 px-1 relative" :class="isWeekend(day) ? 'bg-red-50' : ''">
+                                                <div class="flex items-center gap-1">
+                                                    <input
+                                                        type="number"
+                                                        step="0.01"
+                                                        class="w-full px-2 py-1.5 text-center text-sm bg-white border border-slate-200 rounded focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500"
+                                                        :placeholder="'-'"
+                                                        x-model="monthlyData[testId + '_' + day]"
+                                                        @change="markDirty(testId, day)"
+                                                    >
+                                                    <button
+                                                        class="p-1 text-slate-400 hover:text-blue-600 hover:bg-blue-50 rounded transition-colors"
+                                                        :title="monthlyData[testId + '_' + day + '_comment'] || 'Add comment'"
+                                                        @click.stop="toggleComment(testId, day)"
+                                                    >
+                                                        <i class="fa-solid fa-comment text-xs" :class="monthlyData[testId + '_' + day + '_comment'] ? 'text-blue-500' : ''"></i>
+                                                    </button>
+                                                </div>
+                                                <div
+                                                    x-show="showCommentId === testId + '_' + day"
+                                                    x-transition
+                                                    class="absolute z-10 top-full left-0 mt-1 w-48"
+                                                    @click.outside="showCommentId = null"
                                                 >
+                                                    <textarea
+                                                        class="w-full px-2 py-1.5 text-xs bg-white border border-slate-200 rounded shadow-lg focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 resize-none"
+                                                        rows="2"
+                                                        placeholder="Add comment..."
+                                                        x-model="monthlyData[testId + '_' + day + '_comment']"
+                                                        @keydown.enter.prevent
+                                                    ></textarea>
+                                                </div>
                                             </td>
                                         </template>
                                     </tr>
@@ -191,6 +214,7 @@ document.addEventListener('alpine:init', () => {
         dirtyCells: new Set(),
         operation: 'replace',
         saveResult: null,
+        showCommentId: null,
 
         init() {
             this.loadDraft();
@@ -230,6 +254,15 @@ document.addEventListener('alpine:init', () => {
             this.dirtyCells.add(testId + '_' + day);
         },
 
+        toggleComment(testId, day) {
+            const id = testId + '_' + day;
+            if (this.showCommentId === id) {
+                this.showCommentId = null;
+            } else {
+                this.showCommentId = id;
+            }
+        },
+
         async loadControls() {
             this.errors = {};
             this.controls = [];
@@ -311,9 +344,13 @@ document.addEventListener('alpine:init', () => {
                     const data = await response.json();
                     if (data.status === 'success') {
                         const formValues = data.data.formValues || {};
+                        const comments = data.data.comments || {};
                         for (const [day, value] of Object.entries(formValues)) {
                             this.monthlyData[testId + '_' + day] = value;
                         }
+                        for (const [day, comment] of Object.entries(comments)) {
+                            this.monthlyData[testId + '_' + day + '_comment'] = comment;
+                        }
                         if (!this.comment && data.data.comment) {
                             this.comment = data.data.comment;
                         }
@@ -354,17 +391,23 @@ document.addEventListener('alpine:init', () => {
                 const tests = [];
                 for (const testId of this.selectedTests) {
                     const resvalue = {};
+                    const rescomment = {};
                     let hasData = false;
                     for (let day = 1; day <= this.daysInMonth; day++) {
                         const key = testId + '_' + day;
                         const value = this.monthlyData[key];
+                        const commentKey = testId + '_' + day + '_comment';
+                        const comment = this.monthlyData[commentKey];
                         if (value !== undefined && value !== null && value !== '') {
                             resvalue[day] = value;
                             hasData = true;
                         }
+                        if (comment !== undefined && comment !== null && comment !== '') {
+                            rescomment[day] = comment;
+                        }
                     }
                     if (hasData) {
-                        tests.push({ testId, resvalue });
+                        tests.push({ testId, resvalue, rescomment });
                     }
                 }