diff --git a/.gitlab-ci.d/custom-runners.yml b/.gitlab-ci.d/custom-runners.yml
index 564b94565d..0d3e4a7b4b 100644
--- a/.gitlab-ci.d/custom-runners.yml
+++ b/.gitlab-ci.d/custom-runners.yml
@@ -137,7 +137,7 @@ ubuntu-20.04-aarch64-all-linux-static:
  - aarch64
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
- - if: "$S390X_RUNNER_AVAILABLE"
+ - if: "$AARCH64_RUNNER_AVAILABLE"
  script:
  # --disable-libssh is needed because of https://bugs.launchpad.net/qemu/+bug/1838763
  # --disable-glusterfs is needed because there's no static version of those libs in distro supplied packages
@@ -157,7 +157,7 @@ ubuntu-20.04-aarch64-all:
  - aarch64
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
- - if: "$S390X_RUNNER_AVAILABLE"
+ - if: "$AARCH64_RUNNER_AVAILABLE"
  script:
  - mkdir build
  - cd build
@@ -174,7 +174,7 @@ ubuntu-20.04-aarch64-alldbg:
  - aarch64
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
- - if: "$S390X_RUNNER_AVAILABLE"
+ - if: "$AARCH64_RUNNER_AVAILABLE"
  script:
  - mkdir build
  - cd build
@@ -193,7 +193,7 @@ ubuntu-20.04-aarch64-clang:
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
    when: manual
- - if: "$S390X_RUNNER_AVAILABLE"
+ - if: "$AARCH64_RUNNER_AVAILABLE"
    when: manual
  script:
  - mkdir build
@@ -211,7 +211,7 @@ ubuntu-20.04-aarch64-tci:
  - aarch64
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
- - if: "$S390X_RUNNER_AVAILABLE"
+ - if: "$AARCH64_RUNNER_AVAILABLE"
  script:
  - mkdir build
  - cd build
@@ -228,7 +228,7 @@ ubuntu-20.04-aarch64-notcg:
  rules:
  - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
    when: manual
- - if: "$S390X_RUNNER_AVAILABLE"
+ - if: "$AARCH64_RUNNER_AVAILABLE"
    when: manual
  script:
  - mkdir build
diff --git a/docs/devel/ci-jobs.rst b/docs/devel/ci-jobs.rst
index 9cd9819786..277975e4ad 100644
--- a/docs/devel/ci-jobs.rst
+++ b/docs/devel/ci-jobs.rst
@@ -38,3 +38,14 @@ these artifacts are not already cached, downloading them make the jobs
 reach the timeout limit). Set this variable to have the tests using the
 Avocado framework run automatically.
 
+AARCH64_RUNNER_AVAILABLE
+~~~~~~~~~~~~~~~~~~~~~~~~
+If you've got access to an aarch64 host that can be used as a gitlab-CI
+runner, you can set this variable to enable the tests that require this
+kind of host. The runner should be tagged with "aarch64".
+
+S390X_RUNNER_AVAILABLE
+~~~~~~~~~~~~~~~~~~~~~~
+If you've got access to an IBM Z host that can be used as a gitlab-CI
+runner, you can set this variable to enable the tests that require this
+kind of host. The runner should be tagged with "s390x".