diff --git a/Color.cpp b/Color.cpp
index 0d21e19..63a82de 100644
--- a/Color.cpp
+++ b/Color.cpp
@@ -45,7 +45,8 @@ static const NamedColor StdColor[] = {
    { "FUCHSIA", FUCHSIA},
    { "PURPLE", PURPLE},
    { "ORANGE", ORANGE},
-   { "BROWN", BROWN}
+   { "BROWN", BROWN},
+   { "INVISIBLE", INVISIBLE}
 } ;
 static const int NUM_STDCOLOR = ( sizeof(StdColor) / sizeof(StdColor[0]) ) ;