diff --git a/taiga/projects/notifications/squashing.py b/taiga/projects/notifications/squashing.py
index bd7ca66f..13ff9b3b 100644
--- a/taiga/projects/notifications/squashing.py
+++ b/taiga/projects/notifications/squashing.py
@@ -29,7 +29,6 @@ EXCLUDED_FIELDS = (
 NON_SQUASHABLE_FIELDS = (
     'points',
     'attachments',
-    'tags',
     'watchers',
     'description_diff',
     'content_diff',
@@ -49,9 +48,14 @@ def summary(field, entries):
     if len(entries) <= 1:
         return entries
 
+    # Apply squashing algorithm. In this case, get first `from` and last `to`.
     initial = entries[0].values_diff[field]
     final = entries[-1].values_diff[field]
     from_, to = initial[0], final[1]
+
+    # If the resulting squashed `from` and `to` are equal we can skip
+    # this entry completely
+
     return [] if from_ == to else [HistoryEntry('', {field: [from_, to]})]
 
 
diff --git a/tests/unit/test_notifications_squashing.py b/tests/unit/test_notifications_squashing.py
index a481d6f8..bb6b6228 100644
--- a/tests/unit/test_notifications_squashing.py
+++ b/tests/unit/test_notifications_squashing.py
@@ -84,3 +84,16 @@ def test_squash_values_diff_with_multiple_fields():
 
     squashed = squashing.squash_history_entries(history_entries)
     assert_(expected, squashed, ordered=False)
+
+
+def test_squash_arrays():
+    history_entries = [
+        squashing.HistoryEntry(comment='', values_diff={'tags': [['A', 'B'], ['A']]}),
+        squashing.HistoryEntry(comment='', values_diff={'tags': [['A'], ['A', 'C']]}),
+    ]
+    expected = [
+        squashing.HistoryEntry(comment='', values_diff={'tags': [['A', 'B'], ['A', 'C']]}),
+    ]
+
+    squashed = squashing.squash_history_entries(history_entries)
+    assert_(expected, squashed, ordered=False)