diff --git a/default.env b/default.env
index 9d1b8828..b81d64c2 100644
--- a/default.env
+++ b/default.env
@@ -15,6 +15,12 @@ BASE_URL=http://localhost:7007
 # Requires RHDH 1.9+ to be handled.
 CATALOG_INDEX_IMAGE=quay.io/rhdh/plugin-catalog-index:1.10
 
+# Extra catalog index images (comma-separated).
+# Plugins from these images appear in the Extensions UI but are not installed by default.
+# Supports both plain refs and named refs: name=<image_ref>,<image_ref>
+# Requires RHDH 1.10+ to be handled.
+#EXTRA_CATALOG_INDEX_IMAGES=community=quay.io/rhdh/plugin-catalog-index:1.10
+
 # Path in the install-dynamic-plugins container where the extensions catalog entities should be extracted to, from the catalog index image
 # Requires RHDH 1.9+ to be handled
 CATALOG_ENTITIES_EXTRACT_DIR=/extensions
diff --git a/docs/rhdh-local-guide/configuration.md b/docs/rhdh-local-guide/configuration.md
index 7e097dc9..137083fe 100644
--- a/docs/rhdh-local-guide/configuration.md
+++ b/docs/rhdh-local-guide/configuration.md
@@ -55,6 +55,8 @@ echo "LOG_LEVEL=debug" >> .env
 Common variables to customize:
 
 - `RHDH_IMAGE`: RHDH container image version
+- `CATALOG_INDEX_IMAGE`: Primary plugin catalog index image
+- `EXTRA_CATALOG_INDEX_IMAGES`: Additional catalog index images (comma-separated). See the [catalog index docs](dynamic-plugins-management.md#extra-catalog-index-images) for details
 - `LOG_LEVEL`: RHDH application log level
 - GitHub authentication variables (see the [GitHub auth guide](github-auth.md))
 
diff --git a/docs/rhdh-local-guide/dynamic-plugins-management.md b/docs/rhdh-local-guide/dynamic-plugins-management.md
index 2b7d10af..07f0141c 100644
--- a/docs/rhdh-local-guide/dynamic-plugins-management.md
+++ b/docs/rhdh-local-guide/dynamic-plugins-management.md
@@ -96,6 +96,25 @@ The default value of the `CATALOG_INDEX_IMAGE` environment variable is defined i
 CATALOG_INDEX_IMAGE=my-registry.example.com/org/my-rhdh-plugin-catalog-index:1.2-3
 ```
 
+### Extra catalog index images
+
+Starting in 1.10, you can configure additional catalog index images alongside the primary one using the `EXTRA_CATALOG_INDEX_IMAGES` environment variable. Plugins from these extra images appear in the Extensions UI but are not installed by default (they do not contribute `dynamic-plugins.default.yaml` files).
+
+Set `EXTRA_CATALOG_INDEX_IMAGES` in your `.env` file as a comma-separated list of image references. You can optionally prefix each reference with a name for cleaner extraction directory names:
+
+```bash
+# Plain image references (directory names are auto-derived from the image ref)
+EXTRA_CATALOG_INDEX_IMAGES=quay.io/my-org/my-catalog-index:1.0
+
+# Named references (recommended — produces cleaner directory names like /extensions/extra/community/)
+EXTRA_CATALOG_INDEX_IMAGES=community=quay.io/rhdh/plugin-catalog-index:1.10
+
+# Multiple images
+EXTRA_CATALOG_INDEX_IMAGES=community=quay.io/rhdh/plugin-catalog-index:1.10,partner=quay.io/my-org/partner-catalog:2.0
+```
+
+Extra catalog entities are extracted under `<CATALOG_ENTITIES_EXTRACT_DIR>/extra/<name>/`, keeping them separate from the primary catalog index.
+
 ### Configuration Structure
 
 Your override file must start with: