diff --git a/documentation/source/readme/C Coding Style Guide.rst b/documentation/source/readme/C Coding Style Guide.rst
index 11e540f65304fc0ed7e95dbacbf6d1f46527ee64..acd285b533334c8302318053ea86d503e2287ff0 100644
--- a/documentation/source/readme/C Coding Style Guide.rst	
+++ b/documentation/source/readme/C Coding Style Guide.rst	
@@ -89,6 +89,7 @@ Rule 1.1 Name identifiers in camel case style.
 +-----------------------------------+-----------------------------------+
 
 .. note:: 
+
    * The ``constant`` in the above table refers to the variable of the basic data type, enumeration, and string type of the const modifier under the global scope, excluding array, struct and union.
    * The ``variable`` in the above table refers to variables other than the constant definition, all using lowercase.