updated BOARD_TAG to indicate show_submenu target

andrew hutchison · andrew hutchison · commit 42194444173b · 2016-02-19T15:05:26.000-07:00
diff --git a/arduino-mk-vars.md b/arduino-mk-vars.md
@@ -281,7 +281,7 @@ BOARD_TAG = uno or mega2560
 
 **Description:**
 
-1.5+ submenu as listed in `boards.txt`
+1.5+ submenu as listed in `boards.txt` or `make show_submenu`.
 
 **Example:**
 
