Update README.md

README.md

@@ -18,12 +18,31 @@ require('specs').setup{
     show_jumps  = true,
     min_jump = 30,
     popup = {
-        delay_ms = 0, 
-        inc_ms = 10,
-        blend = 10,
+        delay_ms = 0, -- delay before popup displays
+        inc_ms = 10, -- time increments used for fade/resize effects 
+        blend = 10, -- starting blend, between 0-100 (fully transparent), see :h winblend
         width = 10,
         fader = require('specs').linear_fader,
         resizer = require('specs').shrink_resizer
     }
 }
 ```
+You can implement your own custom fader/resizer functions for some pretty cool effects:
+```lua
+require('specs').setup{ 
+    popup = {
+	-- Simple constant blend effect
+        fader = function(blend, cnt)
+            if cnt > 100 then
+                return 80
+            else return nil end
+        end,
+	-- Growing effect from left to right
+        resizer = function(width, ccol, cnt)
+            if width-cnt > 0 then
+                return {width+cnt, ccol}
+            else return nil end
+        end,
+    }
+}
+```