diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index c0d1600..30f6b44 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -5,6 +5,15 @@ cozystack.installer Release Notes
 Unreleased
 ==========
 
+- The role docs list the minimal platform variants for
+  ``cozystack_platform_variant``:
+  ``isp-slim``, ``isp-slim-generic`` and ``isp-hosted-slim``. They need a
+  Cozystack release that includes cozystack/cozystack#4595. On
+  generic Linux use ``isp-slim-generic``: it installs the base platform
+  only, networking is Cilium without Kube-OVN, and the pod CIDR comes
+  from k3s. The chart ignores ``cozystack_pod_cidr``,
+  ``cozystack_pod_gateway``, ``cozystack_svc_cidr`` and
+  ``cozystack_join_cidr`` there.
 - CI: new ``hack/check-versions.sh`` invariant check runs in the ``Lint``
   job and fails the build if version strings drift across the three
   tracked dependencies: the ``cozy-installer`` chart version must match
diff --git a/README.md b/README.md
index 01c33aa..9f23e9a 100644
--- a/README.md
+++ b/README.md
@@ -323,7 +323,7 @@ cluster-cidr: 10.42.0.0/16
 service-cidr: 10.43.0.0/16
 ```
 
-These CIDRs are the k3s defaults. The example clusters set them via the `server_config_yaml` variable consumed by `k3s.orchestration`, defined in `examples/<distro>/inventory.yml`. The role variables `cozystack_pod_cidr` and `cozystack_svc_cidr` must match — they default to the same values.
+These CIDRs are the k3s defaults. The example clusters set them via the `server_config_yaml` variable consumed by `k3s.orchestration`, defined in `examples/<distro>/inventory.yml`. The role variables `cozystack_pod_cidr` and `cozystack_svc_cidr` must match — they default to the same values. On isp-slim-generic, the slim variant for k3s, the chart ignores both: Cilium takes pod ranges from k3s.
 
 ## Installation
 
@@ -407,7 +407,7 @@ Runs on `server[0]` only.
 | `cozystack_helm_version` | `3.20.0` | Helm binary version to install |
 | `cozystack_helm_binary` | `/usr/local/bin/helm` | Path to Helm binary on target |
 | `cozystack_create_platform_package` | `true` | Create Platform Package CR after install |
-| `cozystack_platform_variant` | `isp-full-generic` | Platform variant: default, isp-full, isp-hosted, isp-full-generic |
+| `cozystack_platform_variant` | `isp-full-generic` | Platform variant: default, isp-full, isp-hosted, isp-full-generic. Cozystack releases that include cozystack/cozystack#4595 also accept isp-slim-generic (the minimal variant for k3s), isp-slim (its Talos counterpart) and isp-hosted-slim. |
 | `cozystack_root_host` | `""` | Domain for Cozystack services (empty = skip publishing) |
 | `cozystack_external_ips` | `[]` | List of external IPs for ingress-nginx Service. Required on platforms without a native LB (cloud VMs, bare metal). Each entry must be a valid IPv4/IPv6 address. |
 | `cozystack_tenant_root_ingress` | `false` | Enable ingress on the root tenant. When `true`, patches the root Tenant CR after Platform Package apply to create IngressClass and ingress-nginx controller. |
diff --git a/roles/cozystack/defaults/main.yml b/roles/cozystack/defaults/main.yml
index f7670ee..1171099 100644
--- a/roles/cozystack/defaults/main.yml
+++ b/roles/cozystack/defaults/main.yml
@@ -50,7 +50,14 @@ cozystack_helm_diff_version: "3.12.5"
 cozystack_create_platform_package: true
 
 # Platform Package variant (determines which platform components are deployed)
-# Available: default, isp-full, isp-hosted, isp-full-generic
+# Available: default, isp-full, isp-hosted, isp-full-generic.
+# Newer Cozystack releases also ship isp-slim, isp-slim-generic and
+# isp-hosted-slim (added by cozystack/cozystack#4595).
+# They install the base platform only. isp-slim-generic is the one for
+# k3s; isp-slim is its Talos counterpart. Both run Cilium without
+# Kube-OVN, and isp-hosted-slim uses the host CNI,
+# so the chart ignores cozystack_pod_cidr, cozystack_pod_gateway,
+# cozystack_svc_cidr and cozystack_join_cidr there.
 cozystack_platform_variant: "isp-full-generic"
 
 # Domain for Cozystack services (dashboard, grafana, etc.)