diff --git a/pycore/tikzeng.py b/pycore/tikzeng.py
index f29e12050f0c98c5411d34d3cc3ece71880bdc7c..8e988c449c3733c73b96b9f8630beda874adcddf 100644
--- a/pycore/tikzeng.py
+++ b/pycore/tikzeng.py
@@ -20,6 +20,7 @@ def to_cor():
 \def\FcColor{rgb:blue,5;red,2.5;white,5}
 \def\FcReluColor{rgb:blue,5;red,5;white,4}
 \def\SoftmaxColor{rgb:magenta,5;black,7}   
+\def\SumColor{rgb:blue,5;green,15}
 """
 
 def to_begin():
@@ -164,6 +165,19 @@ def to_SoftMax( name, s_filer=10, offset="(0,0,0)", to="(0,0,0)", width=1.5, hei
     };
 """
 
+def to_Sum( name, offset="(0,0,0)", to="(0,0,0)", radius=2.5, opacity=0.6):
+    return r"""
+\pic[shift={"""+ offset +"""}] at """+ to +""" 
+    {Ball={
+        name=""" + name +""",
+        fill=\SumColor,
+        opacity="""+ str(opacity) +""",
+        radius="""+ str(radius) +""",
+        logo=$+$
+        }
+    };
+"""
+
 
 def to_connection( of, to):
     return r"""
diff --git a/pyexamples/test_simple.py b/pyexamples/test_simple.py
index e90b0a11fe28c799099489d9d6e7c32a7a41ab5f..67a1cfacd1fff92c767adc2870cace923fa9b5b8 100644
--- a/pyexamples/test_simple.py
+++ b/pyexamples/test_simple.py
@@ -15,6 +15,8 @@ arch = [
     to_Pool("pool2", offset="(0,0,0)", to="(conv2-east)", height=28, depth=28, width=1),
     to_SoftMax("soft1", 10 ,"(3,0,0)", "(pool1-east)", caption="SOFT"  ),
     to_connection("pool2", "soft1"),    
+    to_Sum("sum1", offset="(1.5,0,0)", to="(soft1-east)", radius=2.5, opacity=0.6),
+    to_connection("soft1", "sum1"),
     to_end()
     ]