diff --git a/docs/android-questionnaire-api.md b/docs/android-questionnaire-api.md
index f5ed61f..0abb77f 100644
--- a/docs/android-questionnaire-api.md
+++ b/docs/android-questionnaire-api.md
@@ -176,8 +176,20 @@ Success:
   "ok": true,
   "data": {
     "clients": [
-      "CLIENT-001",
-      "CLIENT-002"
+      {
+        "clientCode": "CLIENT-001",
+        "completedQuestionnaires": [
+          {
+            "questionnaireID": "questionnaire_1_demographic_information",
+            "sumPoints": 42,
+            "completedAt": 1714471800
+          }
+        ]
+      },
+      {
+        "clientCode": "CLIENT-002",
+        "completedQuestionnaires": []
+      }
     ]
   }
 }
@@ -185,7 +197,12 @@ Success:
 
 Fields:
 
-- `clients`: array of client code strings assigned to the coach, ordered alphabetically.
+- `clients`: array of client objects assigned to the coach, ordered alphabetically by `clientCode`.
+- `clients[].clientCode`: the client's code string.
+- `clients[].completedQuestionnaires`: array of questionnaires already completed by this client. Empty array if none.
+- `clients[].completedQuestionnaires[].questionnaireID`: the questionnaire ID, matching the IDs from the questionnaire list endpoint.
+- `clients[].completedQuestionnaires[].sumPoints`: total points from the last upload for this questionnaire.
+- `clients[].completedQuestionnaires[].completedAt`: Unix timestamp (seconds) of when the questionnaire was completed, or `null` if not recorded.
 
 Common failures:
 
@@ -411,7 +428,18 @@ data class SubmitQuestionnaireResponse(
 )
 
 data class ClientsResponse(
-    val clients: List<String>
+    val clients: List<ClientInfo>
+)
+
+data class ClientInfo(
+    val clientCode: String,
+    val completedQuestionnaires: List<CompletedQuestionnaire> = emptyList()
+)
+
+data class CompletedQuestionnaire(
+    val questionnaireID: String,
+    val sumPoints: Int,
+    val completedAt: Long?
 )
 ```
 
@@ -453,4 +481,4 @@ interface QuestionnaireApi {
 }
 ```
 
-Pass the token as `Bearer $token`.
+Pass the token as `Bearer $token`.
\ No newline at end of file
diff --git a/handlers/app_questionnaires.php b/handlers/app_questionnaires.php
index 0720a44..9dbc26b 100644
--- a/handlers/app_questionnaires.php
+++ b/handlers/app_questionnaires.php
@@ -175,7 +175,32 @@ if ($fetchClients) {
         ORDER BY clientCode
     ");
     $stmt->execute([':cid' => $coachID]);
-    $clients = $stmt->fetchAll(PDO::FETCH_COLUMN);
+    $clientCodes = $stmt->fetchAll(PDO::FETCH_COLUMN);
+
+    $completions = [];
+    if (!empty($clientCodes)) {
+        $placeholders = implode(',', array_fill(0, count($clientCodes), '?'));
+        $stmt2 = $pdo->prepare("
+            SELECT clientCode, questionnaireID, sumPoints, completedAt
+            FROM completed_questionnaire
+            WHERE clientCode IN ($placeholders)
+        ");
+        $stmt2->execute($clientCodes);
+        foreach ($stmt2->fetchAll(PDO::FETCH_ASSOC) as $row) {
+            $completions[$row['clientCode']][] = [
+                'questionnaireID' => $row['questionnaireID'],
+                'sumPoints'       => (int) $row['sumPoints'],
+                'completedAt'     => $row['completedAt'] !== null ? (int) $row['completedAt'] : null,
+            ];
+        }
+    }
+
+    $clients = array_map(function ($code) use ($completions) {
+        return [
+            'clientCode'             => $code,
+            'completedQuestionnaires' => $completions[$code] ?? [],
+        ];
+    }, $clientCodes);
 
     qdb_discard($tmpDb, $lockFp);
     json_success(['coachID' => $coachID, 'clients' => $clients]);