diff --git a/snippets/csharp/System.Linq/Enumerable/AggregateTSource/enumerable.cs b/snippets/csharp/System.Linq/Enumerable/AggregateTSource/enumerable.cs
index b1acf2a1430..1b141106229 100644
--- a/snippets/csharp/System.Linq/Enumerable/AggregateTSource/enumerable.cs
+++ b/snippets/csharp/System.Linq/Enumerable/AggregateTSource/enumerable.cs
@@ -3357,5 +3357,44 @@ Sara Jones (Sara.jones@example.com)
             // </Snippet208>
         }
         #endregion
+
+        #region CountBy
+        static class CountBy
+        {
+            
+            public static void CountByDepartmentExample()
+            {
+                // <Snippet209>
+                (string Name, int Age, string Department)[] employees =
+                {
+                    ("Saly", 23, "IT"),
+                    ("David", 25, "Sales"),
+                    ("Mahmoud", 22, "IT"),
+                    ("Qamar", 22, "HR"),
+                    ("Sara", 25, "IT"),
+                    ("John", 26, "HR"),
+                    ("Jaffar", 32, "Sales")
+                };
+
+                // Count the number of employees per department
+                var countPerDepartment = employees.CountBy(employee => employee.Department);
+
+                foreach (var item in countPerDepartment)
+                {
+                    Console.WriteLine($"Department: {item.Key} - Employees Count: {item.Value}");
+                }
+
+                /*
+                This code produces the following output:
+
+                Department: IT - Employees Count: 3
+                Department: Sales - Employees Count: 2
+                Department: HR - Employees Count: 2
+                */
+                // </Snippet209>
+            }
+            
+        }
+        #endregion
     }
 }
diff --git a/xml/System.Linq/Enumerable.xml b/xml/System.Linq/Enumerable.xml
index 95791bba536..6062de43daa 100644
--- a/xml/System.Linq/Enumerable.xml
+++ b/xml/System.Linq/Enumerable.xml
@@ -3004,7 +3004,17 @@ Each chunk except the last one will be of size `size`. The last chunk will conta
         <param name="keyComparer">An <see cref="T:System.Collections.Generic.IEqualityComparer`1" /> to compare keys with.</param>
         <summary>Returns the count of elements in the source sequence grouped by key.</summary>
         <returns>An enumerable containing the frequencies of each key occurrence in <paramref name="source" />.</returns>
-        <remarks>To be added.</remarks>
+        <remarks>
+          <format type="text/markdown"><![CDATA[
+
+## Examples
+
+The following code example demonstrates how to use `CountBy` to calculate the number of employees in each department.
+
+:::code language="csharp" source="~/snippets/csharp/System.Linq/Enumerable/AggregateTSource/enumerable.cs" id="Snippet209":::
+
+          ]]></format>
+        </remarks>
       </Docs>
     </Member>
     <MemberGroup MemberName="DefaultIfEmpty&lt;TSource&gt;">