diff --git a/docs/docker-deployment.md b/docs/docker-deployment.md
index 03b4d9c8b..55ef9a65c 100644
--- a/docs/docker-deployment.md
+++ b/docs/docker-deployment.md
@@ -132,6 +132,7 @@ Then set the following as appropriate for your S3 bucket:
 - `S3_REGION`
 - `S3_ACCESS_KEY_ID`
 - `S3_SECRET_ACCESS_KEY`
+- `CSP_CONNECT_SRC`
 
 If you're using a provider other than AWS, you will also need some of the following:
 
diff --git a/docs/kamal-deployment.md b/docs/kamal-deployment.md
index 19aa208c8..b9d0efc04 100644
--- a/docs/kamal-deployment.md
+++ b/docs/kamal-deployment.md
@@ -103,6 +103,7 @@ To use the included `s3` service, set:
 - `S3_BUCKET` (defaults to `fizzy-#{Rails.env}-activestorage`)
 - `S3_REGION` (defaults to `us-east-1`)
 - `S3_SECRET_ACCESS_KEY`
+- `CSP_CONNECT_SRC`
 
 Optional for S3-compatible endpoints: