Additional performance TODOs.
diff --git a/cursor.go b/cursor.go
index 092bd5a..62990df 100644
--- a/cursor.go
+++ b/cursor.go
@@ -9,13 +9,14 @@
 )
 
 // TODO: research aligned read/write:
+// https://github.com/fmstephe/fatomic/blob/master/slice.go
 // https://groups.google.com/forum/#!topic/golang-nuts/XDfQUn4U_g8
 // https://gist.github.com/anachronistic/7495541
 // http://blog.chewxy.com/2013/12/10/pointer-tagging-in-go/
 // http://www.goinggo.net/2014/01/concurrency-goroutines-and-gomaxprocs.html
 type Cursor struct {
 	sequence int64
-	padding  [cpuCacheLinePadding]int64
+	padding  [cpuCacheLinePadding]int64 // https://github.com/fmstephe/fatomic/blob/master/paddedint.go
 }
 
 func NewCursor() *Cursor {