diff --git a/084-sort.go b/084-sort.go
index 2bcc24f..a3fcd77 100644
--- a/084-sort.go
+++ b/084-sort.go
@@ -1,20 +1,28 @@
-package main      
-
-import "fmt"
+package main                         // The `sort` package implements sorting for builtins
+                                     // and user-defined types. We'll look at some of the
+import "fmt"                         // sorts for builtins here.
 import "sort"
 
 func main() {
 	strs := []string{"c", "a", "b"}
-	sort.Strings(strs)
-	fmt.Println(strs)
+	sort.Strings(strs)               // Sort methods are specific to the builtin type.
+	fmt.Println(strs)                // Sorting is in-place (doesn't return a new slice).
 
     ints := []int{7, 2, 4}
-    sort.Ints(ints)
+    sort.Ints(ints)                  // Sorting methods are named after the type.
     fmt.Println(ints)
+
+    s := sort.IntsAreSorted(ints)    // Check if a slice is in sorted order.
+    fmt.Println(s)
+
+    i := sort.SearchInts(ints, 4)    // Binary-search a sorted slice for a value.
+    fmt.Println(i)                   // Returns the index if found, or `-1` if not.
 }
 
 /*
 $ go run sort.go
-[foo bar bat]
+[a b c]
 [2 4 7]
+true
+1
 */