diff --git a/cache.go b/cache.go
index f602d5e..5420e00 100644
--- a/cache.go
+++ b/cache.go
@@ -16,7 +16,7 @@ type Item struct {
 	Expiration int64
 }
 
-// Returns true if the item has expired.
+// Expired Returns true if the item has expired.
 func (item Item) Expired() bool {
 	if item.Expiration == 0 {
 		return false
@@ -25,9 +25,9 @@ func (item Item) Expired() bool {
 }
 
 const (
-	// For use with functions that take an expiration time.
+	// NoExpiration For use with functions that take an expiration time.
 	NoExpiration time.Duration = -1
-	// For use with functions that take an expiration time. Equivalent to
+	// DefaultExpiration For use with functions that take an expiration time. Equivalent to
 	// passing in the same expiration duration as was given to New() or
 	// NewFrom() when the cache was created (e.g. 5 minutes.)
 	DefaultExpiration time.Duration = 0
@@ -46,7 +46,7 @@ type cache struct {
 	janitor           *janitor
 }
 
-// Add an item to the cache, replacing any existing item. If the duration is 0
+// Set Add an item to the cache, replacing any existing item. If the duration is 0
 // (DefaultExpiration), the cache's default expiration time is used. If it is -1
 // (NoExpiration), the item never expires.
 func (c *cache) Set(k string, x interface{}, d time.Duration) {
diff --git a/go.mod b/go.mod
index 92168b4..8ba8c9d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module github.com/vmpartner/go-cache
 
-go 1.12
+go 1.16