diff --git a/flow/overview/README.md b/flow/overview/README.md
index ab9b9ce..627273d 100644
--- a/flow/overview/README.md
+++ b/flow/overview/README.md
@@ -1,14 +1,60 @@
 
 ## Terminal 
+
+### Beginning of a program or function
+
 {% raw %} 
   <pre class="mermaid">
     flowchart LR
       id1([Start])
   </pre>
+{% endraw %}
+
+### Ending of a program or function
+
+{% raw %} 
   <pre class="mermaid">
     flowchart LR
       id1([Stop])
   </pre>  
 {% endraw %}
 
+## Process
+
+For arithmetic operations and data-manipulations. 
+
+{% raw %} 
+  <pre class="mermaid">
+    flowchart LR
+      id1(Process)
+  </pre>  
+{% endraw %}
+
+## Decision
+
+{% raw %} 
+  <pre class="mermaid">
+    flowchart LR
+      id1{Decision}
+  </pre>  
+{% endraw %}
+
+## Input/Output
+
+{% raw %} 
+  <pre class="mermaid">
+    flowchart LR
+      id1[/Input/]
+  </pre>  
+{% endraw %}
+
+## Function
+
+{% raw %} 
+  <pre class="mermaid">
+    flowchart LR
+      id1[[Function]]
+  </pre>  
+{% endraw %}
+