Added "Hold the Shift key to expand sub-entries." to the tooltip for the expand all button.

diff --git a/Locales/devel-enUS.lua b/Locales/devel-enUS.lua
index d4dd88b..c4cb558 100644
--- a/Locales/devel-enUS.lua
+++ b/Locales/devel-enUS.lua
@@ -344,7 +344,7 @@ L["FILTER_OPEN_DESC"]		= "Open filter option panel."
 L["FILTER_CLOSE"]			= "<<< Filter"
 L["FILTER_CLOSE_DESC"]		= "Close filter option panel."
 L["EXPANDALL"]				= "+ All"
-L["EXPANDALL_DESC"]			= "Expand all recipes listed below."
+L["EXPANDALL_DESC"]			= "Expand all recipes listed below. Hold the Shift key to expand sub-entries."
 L["CONTRACTALL"]			= "- All"
 L["CONTRACTALL_DESC"]		= "Minimize all recipes listed below."
 L["SEARCH_DESC"]			= "Filter to recipes that contain text at left."