diff --git a/syntax/edc.vim b/syntax/edc.vim
index 868ad25..646ba05 100644
--- a/syntax/edc.vim
+++ b/syntax/edc.vim
@@ -58,7 +58,7 @@ syn keyword	edcLabel 	before after ignore pointer alt_font clip  contained
 syn keyword	edcLazShort 	broadcast nobroadcast mouse nomouse repeat norepeat precise noprecise noscale vis hid contained
 
 syn keyword	edcConstant	COMP RAW LOSSY LOSSY_ETC1 LOSSY_ETC2 NONE ON_HOLD AUTOGRAB NOGRAB
-syn keyword	edcConstant	TEXT IMAGE RECT TEXTBLOCK SWALLOW GRADIENT GROUP
+syn keyword	edcConstant	TEXT IMAGE RECT TEXTBLOCK SWALLOW GRADIENT GROUP EXTERNAL
 syn keyword	edcConstant	SPACER
 syn keyword	edcConstant	NONE PLAIN OUTLINE SOFT_OUTLINE SHADOW PROXY
 syn keyword	edcConstant	SOFT_SHADOW OUTLINE_SHADOW OUTLINE_SOFT_SHADOW