Make godoc happy, and add extra comments.

controller/types.go

@@ -1,18 +1,33 @@
 package controller
 
+// Simple interface to store values shared amongst packages.
 type Controller struct {
-	Blocks    []int
-	Row1      string
-	Row2      string
-	Row3      string
-	Row4      string
-	Row5      string
-	Row6      string
-	Row7      string
-	Row8      string
-	Row9      string
+	// All possible blocks/rows available
+	Blocks []int
+	// 1st row of the Sudoku puzzle.
+	Row1 string
+	// 2nd row of the Sudoku puzzle.
+	Row2 string
+	// 3rd row of the Sudoku puzzle.
+	Row3 string
+	// 4th row of the Sudoku puzzle.
+	Row4 string
+	// 5th row of the Sudoku puzzle.
+	Row5 string
+	// 6th row of the Sudoku puzzle.
+	Row6 string
+	// 7th row of the Sudoku puzzle.
+	Row7 string
+	// 8th row of the Sudoku puzzle.
+	Row8 string
+	// 9th row of the Sudoku puzzle.
+	Row9 string
+	// Slice with all found solutions.
 	Solutions []string
-	NumCPUs   int
-	Split     int
-	Part      int
+	// Number of CPUs Go routines are allowed to use.
+	NumCPUs int
+	// Number of parts the search should be split into.
+	Split int
+	// Which part of the search should the solver focus on.
+	Part int
 }