diff --git a/app/src/main/java/ch/protonmail/android/views/messageDetails/MessageDetailsHeaderView.kt b/app/src/main/java/ch/protonmail/android/views/messageDetails/MessageDetailsHeaderView.kt
index 8deef0997..99316a217 100644
--- a/app/src/main/java/ch/protonmail/android/views/messageDetails/MessageDetailsHeaderView.kt
+++ b/app/src/main/java/ch/protonmail/android/views/messageDetails/MessageDetailsHeaderView.kt
@@ -256,6 +256,9 @@ class MessageDetailsHeaderView @JvmOverloads constructor(
             } else {
                 expandHeader()
             }
+            it.contentDescription = context?.getString(
+                if (isExpanded) R.string.expand_message_details else R.string.collapse_message_details
+            ) ?: ""
             isExpanded = isExpanded.not()
         }
         expandedHeaderGroup.isVisible = false
diff --git a/app/src/main/res/layout/layout_message_details_header.xml b/app/src/main/res/layout/layout_message_details_header.xml
index 4bc8db297..fadacb0bd 100644
--- a/app/src/main/res/layout/layout_message_details_header.xml
+++ b/app/src/main/res/layout/layout_message_details_header.xml
@@ -202,6 +202,7 @@
         android:padding="@dimen/message_details_header_chevron_icon_padding"
         app:srcCompat="@drawable/ic_proton_chevron_down"
         android:visibility="gone"
+        android:contentDescription="@string/expand_message_details"
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/timeDateTextView"
         app:tint="@color/icon_weak"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index f97d4a43f..b4032e905 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -881,4 +881,7 @@
     <string name="details_show_history">Show history</string>
     <string name="could_not_complete_action">Could not complete the action</string>
     <string name="decryption_of_message_failed">Decryption error: decryption of this message\'s encrypted content failed.</string>
+
+    <string name="expand_message_details">Expand Message Details</string>
+    <string name="collapse_message_details">Collapse Message Details</string>
 </resources>