diff --git a/coordinator/startup.lua b/coordinator/startup.lua
index 6dee519..2668f5a 100644
--- a/coordinator/startup.lua
+++ b/coordinator/startup.lua
@@ -12,7 +12,7 @@ local config      = require("coordinator.config")
 local coordinator = require("coordinator.coordinator")
 local renderer    = require("coordinator.renderer")
 
-local COORDINATOR_VERSION = "alpha-v0.2.0"
+local COORDINATOR_VERSION = "alpha-v0.2.1"
 
 local print = util.print
 local println = util.println
diff --git a/coordinator/ui/components/unit_overview.lua b/coordinator/ui/components/unit_overview.lua
index 413a97a..b00c380 100644
--- a/coordinator/ui/components/unit_overview.lua
+++ b/coordinator/ui/components/unit_overview.lua
@@ -23,7 +23,7 @@ local function make(parent, x, y, unit_id)
     TextBox{parent=root,text="Unit #" .. unit_id,alignment=TEXT_ALIGN.CENTER,height=1,fg_bg=style.header}
 
     -- reactor
-    local reactor = Rectangle{parent=root,border=border(1, colors.gray, false),width=30,height=10,x=1,y=3}
+    local reactor = Rectangle{parent=root,border=border(1, colors.gray),width=30,height=10,x=1,y=3}
 
     local text_fg_bg = cpair(colors.black, colors.lightGray)
     local lu_col = cpair(colors.gray, colors.gray)
diff --git a/graphics/core.lua b/graphics/core.lua
index 4bd0d9e..9e7ae4b 100644
--- a/graphics/core.lua
+++ b/graphics/core.lua
@@ -43,13 +43,13 @@ graphics.TEXT_ALIGN = {
 -- create a new border definition
 ---@param width integer border width
 ---@param color color border color
----@param even boolean whether to pad width extra to account for rectangular pixels
+---@param even? boolean whether to pad width extra to account for rectangular pixels, defaults to false
 ---@return graphics_border
 function graphics.border(width, color, even)
     return {
         width = width,
         color = color,
-        even = even
+        even = even or false    -- convert nil to false
     }
 end