diff --git a/res/values/strings.xml b/res/values/strings.xml
index 34bcc0cad..792ce9eec 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -397,10 +397,14 @@
     <string name="systemmsg_group_image_deleted">Group image deleted.</string>
     <string name="systemmsg_member_added">Member %1$s added.</string>
     <string name="systemmsg_member_removed">Member %1$s removed.</string>
-    <string name="systemmsg_group_left">Group left.</string>
+    <string name="systemmsg_group_left">%1$s left this group.</string>
     <string name="systemmsg_read_receipt_subject">Read receipt</string>
     <string name="systemmsg_read_receipt_body">This is a read receipt for the message \"%1$s\".\n\nIt means that message was displayed on the recipient\'s device, not necessarily that the content was read.</string>
     <string name="systemmsg_cannot_decrypt">This message cannot be decrypted.\n\n• It might already help to simply reply to this message and ask the sender to send the message again.\n\n• In case you re-installed Delta Chat or another email program on this or another device you may want to send an Autocrypt Setup Message from there.</string>
+    <!-- Translators: %1$s will be replaced by sth. as "member xy added" (trailing full-stop removed). %2$s will be replaced by the name/addr of the person who did this action. -->
+    <string name="systemmsg_action_by_me">%1$s by me.</string>
+    <!-- Translators: %1$s will be replaced by sth. as "member xy added" (trailing full-stop removed). -->
+    <string name="systemmsg_action_by_user">%1$s by %2$s.</string>
 
 
     <!-- screen lock -->
diff --git a/src/org/thoughtcrime/securesms/connect/ApplicationDcContext.java b/src/org/thoughtcrime/securesms/connect/ApplicationDcContext.java
index a5350c473..4127e1a78 100644
--- a/src/org/thoughtcrime/securesms/connect/ApplicationDcContext.java
+++ b/src/org/thoughtcrime/securesms/connect/ApplicationDcContext.java
@@ -646,6 +646,8 @@ public class ApplicationDcContext extends DcContext {
           case 50: s = context.getString(R.string.chat_self_talk_subtitle); break;
           case 60: s = context.getString(R.string.login_error_cannot_login); break;
           case 61: s = context.getString(R.string.login_error_server_response); break;
+          case 62: s = context.getString(R.string.systemmsg_action_by_user); break;
+          case 63: s = context.getString(R.string.systemmsg_action_by_me); break;
           default: s = null; break;
         }
         return stringToData(s);