Updated check for skada

diff --git a/ElvUI_SLE/ElvUI_SLE.toc b/ElvUI_SLE/ElvUI_SLE.toc
index ff0bbc7..6207b0b 100644
--- a/ElvUI_SLE/ElvUI_SLE.toc
+++ b/ElvUI_SLE/ElvUI_SLE.toc
@@ -7,6 +7,7 @@
 ## eMail: darthpred@gmail.com, repooc@tukui.org
 ## URL: http://tukui.org/
 ## RequiredDeps: ElvUI
+## OptionalDeps: Skada
 ## DefaultState: Enabled

 libs\load_libs.xml
diff --git a/ElvUI_SLE/modules/skins/options.lua b/ElvUI_SLE/modules/skins/options.lua
index 76d3959..befecea 100644
--- a/ElvUI_SLE/modules/skins/options.lua
+++ b/ElvUI_SLE/modules/skins/options.lua
@@ -35,6 +35,7 @@ E.Options.args.sle.args.skins = {
 			args = {
 				skadaback = {
 					order = 4,
+					disabled = function() return not IsAddOnLoaded('Skada') end,
 					type = "toggle",
 					name = L["Skada Backdrop"],
 					desc = L["Show/Hide Skada backdrop."],