diff --git a/modules/util/assume_role/README.md b/modules/util/assume_role/README.md
index 57a0e95..1689eb2 100644
--- a/modules/util/assume_role/README.md
+++ b/modules/util/assume_role/README.md
@@ -24,4 +24,7 @@ This module uses awscli, calls sts and obtain temp credentials for role switchin
     "SessionToken": "333",
     "Expiration": "2023-07-01T10:19:47+00:00"
 }
-```
\ No newline at end of file
+```
+
+# References
+This module is based on https://registry.terraform.io/modules/digitickets/cli/aws/latest
\ No newline at end of file
diff --git a/modules/util/awscli/README.md b/modules/util/awscli/README.md
index 5c72be8..5c72729 100644
--- a/modules/util/awscli/README.md
+++ b/modules/util/awscli/README.md
@@ -50,4 +50,7 @@ awscli_output = [
   "i-0bdd375df2b78a620",
   "i-0655d2b3716b1383e",
 ]
-```
\ No newline at end of file
+```
+
+# References
+This module is based on https://registry.terraform.io/modules/digitickets/cli/aws/latest
\ No newline at end of file