diff --git a/api/src/com/todoroo/astrid/data/History.java b/api/src/com/todoroo/astrid/data/History.java
index 766a992bb..1431dbc38 100644
--- a/api/src/com/todoroo/astrid/data/History.java
+++ b/api/src/com/todoroo/astrid/data/History.java
@@ -131,5 +131,9 @@ public class History extends AbstractModel {
     public static final String COL_IS_SILENT = "is_silent";
     public static final String COL_IS_FAVORITE = "is_favorite";
     public static final String COL_USER_ID = "user_id";
+    public static final String COL_ATTACHMENT_ADDED = "attachment_added";
+    public static final String COL_ATTACHMENT_REMOVED = "attachment_removed";
+    public static final String COL_ACKNOWLEDGED = "acknowledged";
+
 
 }
diff --git a/astrid/res/values/strings-updates.xml b/astrid/res/values/strings-updates.xml
index 64bc66580..e664bd34f 100644
--- a/astrid/res/values/strings-updates.xml
+++ b/astrid/res/values/strings-updates.xml
@@ -25,6 +25,8 @@
     <string name="history_this_task">this task</string>
     <string name="history_tag_added">added %1$s to %2$s</string>
     <string name="history_tag_removed">removed %1$s from %2$s</string>
+    <string name="history_attach_added">attached %1$s to %2$s</string>
+    <string name="history_attach_removed">removed %1$s from %2$s</string>
     <string name="history_left_list">left %s</string>
     <string name="history_deleted">deleted %s</string>
     <string name="history_undeleted">undeleted %s</string>
@@ -68,6 +70,7 @@
     <string name="history_repeat_every">every %s</string>
     <string name="history_repeat_on">on %s</string>
     <string name="history_repeat_from_completion">after completion</string>
+    <string name="history_acknowledged">viewed %s</string>
     
     <string name="history_default">changed %1$s to %2$s</string>
 </resources>
diff --git a/astrid/src/com/todoroo/astrid/adapter/UpdateAdapter.java b/astrid/src/com/todoroo/astrid/adapter/UpdateAdapter.java
index 45bb87235..9a446b037 100644
--- a/astrid/src/com/todoroo/astrid/adapter/UpdateAdapter.java
+++ b/astrid/src/com/todoroo/astrid/adapter/UpdateAdapter.java
@@ -467,6 +467,15 @@ public class UpdateAdapter extends CursorAdapter {
                 else
                     result = context.getString(R.string.history_tag_removed, item, tagName);
 
+            } else if (History.COL_ATTACHMENT_ADDED.equals(column) || History.COL_ATTACHMENT_REMOVED.equals(column)) {
+                JSONArray attachmentArray = new JSONArray(newValue);
+                String attachmentName = attachmentArray.getString(1);
+                if (History.COL_ATTACHMENT_ADDED.equals(column))
+                    result = context.getString(R.string.history_attach_added, item, attachmentName);
+                else
+                    result = context.getString(R.string.history_attach_removed, item, attachmentName);
+            } else if (History.COL_ACKNOWLEDGED.equals(column)) {
+                result = context.getString(R.string.history_acknowledged, item);
             } else if (History.COL_SHARED_WITH.equals(column) || History.COL_UNSHARED_WITH.equals(column)) {
                 JSONArray members = new JSONArray(newValue);
                 String userId = history.getValue(History.USER_UUID);