diff --git a/tests/install_vm.py b/tests/install_vm.py
index 5b5836766c4..bdbe93ad621 100755
--- a/tests/install_vm.py
+++ b/tests/install_vm.py
@@ -14,23 +14,24 @@
     "centos9",
     "rhel8",
     "rhel9",
+    "rhel10",
 ]
 
 # put here any unreleased distro in development that needs to be tested
 # and any working osinfo known to be used by default when installating it
 UNRELEASED_DISTROS_AND_OSINFO = {
-    "rhel10": "rhel9-unknown"
 }
 
 DISTRO_URL = {
     "fedora":
         "https://download.fedoraproject.org/pub/fedora/linux/releases/42/Everything/x86_64/os",
-    "centos8": "http://mirror.centos.org/centos/8-stream/BaseOS/x86_64/os/",
     "centos9": "http://mirror.stream.centos.org/9-stream/BaseOS/x86_64/os/",
+    "centos10": "http://mirror.centos.org/centos/10-stream/BaseOS/x86_64/os/",
+
 }
 DISTRO_EXTRA_REPO = {
-    "centos8": "http://mirror.centos.org/centos/8-stream/AppStream/x86_64/os/",
-    "centos9": "http://mirror.stream.centos.org/9-stream/AppStream/x86_64/os/",
+    "centos9": "http://mirror.centos.org/centos/9-stream/AppStream/x86_64/os/",
+    "centos10": "http://mirror.stream.centos.org/10-stream/AppStream/x86_64/os/",
 }
 
 
@@ -84,7 +85,7 @@ def parse_args():
         "--disk-size",
         dest="disk_size",
         default=20,
-        help="Size of the VM qcow2 disk, default is 20 GiB (ignored when --disk is specified).",
+        help="Size (in GiB) of the VM qcow2 disk, default is 20 GiB (ignored when --disk is specified).",
     )
     parser.add_argument(
         "--disk",
@@ -96,7 +97,7 @@ def parse_args():
         dest="ram",
         default=3072,
         type=int,
-        help="Amount of RAM configured for the VM.",
+        help="Amount of RAM (in MiB) configured for the VM, default is 3072 MiB.",
     )
     parser.add_argument(
         "--cpu",