diff --git a/src/data/roadmaps/aws/content/102-vpc/100-cidr-blocks.md b/src/data/roadmaps/aws/content/102-vpc/100-cidr-blocks.md
index 86f42e0ad..67b9c3c05 100644
--- a/src/data/roadmaps/aws/content/102-vpc/100-cidr-blocks.md
+++ b/src/data/roadmaps/aws/content/102-vpc/100-cidr-blocks.md
@@ -5,3 +5,4 @@
 ## References
 
 - [@official@cidr.xyz: Interactive CIDR range visualizer](https://cidr.xyz/)
+- [@official@VPC - CIRD Blocks](https://docs.aws.amazon.com/pt_br/vpc/latest/userguide/vpc-cidr-blocks.html)