diff --git a/docs/config/tfaction-root-yaml.md b/docs/config/tfaction-root-yaml.md
index ea920fc..7db9709 100644
--- a/docs/config/tfaction-root-yaml.md
+++ b/docs/config/tfaction-root-yaml.md
@@ -136,6 +136,21 @@ target_groups:
     enabled: true
   terraform_plan_config:
     aws_assume_role_arn: arn:aws:iam::000000000000:role/GitHubActions_Terraform_AWS_terraform_plan
+
+    # AWS IAM Role Session Name
+    # tfaction >= v1.11.0
+    # This is optional.
+    # The maximum length of the session name is 64.
+    # And it must satisfy regular expression pattern `[\w+=,.@-]*`.
+    # The default value of session name is
+    # 1. tfaction-{plan or apply}-{normalized target}-${GitHub Actions Run ID}
+    # 2. tfaction-{plan or apply}-{normalized target}
+    # 3. tfaction-{plan or apply}-${GitHub Actions Run ID}
+    # 4. tfaction-{plan or apply}
+    # / in the default targets are converted to `_`.
+    # And if target is too long, it is removed from the default session name.
+    aws_role_session_name: tfplan
+
   tfmigrate_plan_config:
     aws_assume_role_arn: arn:aws:iam::000000000000:role/GitHubActions_Terraform_AWS_tfmigrate_plan
   terraform_apply_config:
diff --git a/docs/config/tfaction-yaml.md b/docs/config/tfaction-yaml.md
index 2195a03..7fa1274 100644
--- a/docs/config/tfaction-yaml.md
+++ b/docs/config/tfaction-yaml.md
@@ -41,6 +41,21 @@ env:
 secrets:
 terraform_plan_config:
   aws_assume_role_arn: arn:aws:iam::000000000000:role/GitHubActions_Terraform_AWS_terraform_plan
+
+  # AWS IAM Role Session Name
+  # tfaction >= v1.11.0
+  # This is optional.
+  # The maximum length of the session name is 64.
+  # And it must satisfy regular expression pattern `[\w+=,.@-]*`.
+  # The default value of session name is
+  # 1. tfaction-{plan or apply}-{normalized target}-${GitHub Actions Run ID}
+  # 2. tfaction-{plan or apply}-{normalized target}
+  # 3. tfaction-{plan or apply}-${GitHub Actions Run ID}
+  # 4. tfaction-{plan or apply}
+  # / in the default targets are converted to `_`.
+  # And if target is too long, it is removed from the default session name.
+  aws_role_session_name: tfplan
+
   env:
     # Environment variables
     FOO: foo