diff --git a/.changes/v1.13/update-cidrblock.yaml b/.changes/v1.13/update-cidrblock.yaml
new file mode 100644
index 000000000000..469bb8d35f81
--- /dev/null
+++ b/.changes/v1.13/update-cidrblock.yaml
@@ -0,0 +1,4 @@
+---
+changes:
+  - description: "update cidrblock in website/docs/language/functions/flatten.mdx."
+    type: bugfix
diff --git a/website/docs/language/functions/flatten.mdx b/website/docs/language/functions/flatten.mdx
index 461f44f343a3..65dc855ff152 100644
--- a/website/docs/language/functions/flatten.mdx
+++ b/website/docs/language/functions/flatten.mdx
@@ -51,34 +51,35 @@ variable "networks" {
       cidr_block = "10.1.0.0/16"
       subnets = {
         "db1" = {
-          cidr_block = "10.1.0.1/16"
+          cidr_block = "10.1.0.0/24"
         }
         "db2" = {
-          cidr_block = "10.1.0.2/16"
+          cidr_block = "10.1.1.0/24"
         }
       }
     },
     "public" = {
-      cidr_block = "10.1.1.0/16"
+      cidr_block = "10.2.0.0/16"
       subnets = {
         "webserver" = {
-          cidr_block = "10.1.1.1/16"
+          cidr_block = "10.2.1.0/24"
         }
         "email_server" = {
-          cidr_block = "10.1.1.2/16"
+          cidr_block = "10.2.2.0/24"
         }
       }
     }
     "dmz" = {
-      cidr_block = "10.1.2.0/16"
+      cidr_block = "10.3.0.0/16"
       subnets = {
         "firewall" = {
-          cidr_block = "10.1.2.1/16"
+          cidr_block = "10.3.1.0/24"
         }
       }
     }
   }
 }
+
 ```
 
 The above is a reasonable way to model objects that naturally form a tree,