diff --git a/setup/wizardsteps.class.inc.php b/setup/wizardsteps.class.inc.php
index 2ee18d9e6..56fd97db0 100644
--- a/setup/wizardsteps.class.inc.php
+++ b/setup/wizardsteps.class.inc.php
@@ -1937,6 +1937,7 @@ EOF
 	public function ComputeChoiceFlags(array $aChoice, string $sChoiceId, array $aSelectedComponents, bool $bAllDisabled, bool $bDisableUninstallCheck, bool $bUpgradeMode)
 	{
 		$oITopExtension = $this->oExtensionsMap->GetFromExtensionCode($aChoice['extension_code']);
+		//If the extension is missing from disk, it won't exist in the ExtensionsMap, thus returning null
 		$bCanBeUninstalled = isset($aChoice['uninstallable']) ? $aChoice['uninstallable'] === true || $aChoice['uninstallable'] === 'yes' : $oITopExtension->CanBeUninstalled();
 		$bSelected = isset($aSelectedComponents[$sChoiceId]) && ($aSelectedComponents[$sChoiceId] == $sChoiceId);
 		$bMissingFromDisk = isset($aChoice['missing']) && $aChoice['missing'] === true;