diff --git a/cluster.go b/cluster.go
index 86d0d5a..beedea5 100644
--- a/cluster.go
+++ b/cluster.go
@@ -79,7 +79,7 @@ func (c *ClusterClient) process(cmd Cmder) {
 
 	c.reloadIfDue()
 
-	hashSlot := HashSlot(cmd.clusterKey())
+	hashSlot := hashSlot(cmd.clusterKey())
 
 	c.cachemx.RLock()
 	defer c.cachemx.RUnlock()
@@ -288,9 +288,9 @@ func (opt *ClusterOptions) clientOptions() *Options {
 
 const hashSlots = 16384
 
-// HashSlot returns a consistent slot number between 0 and 16383
-// for any given string key
-func HashSlot(key string) int {
+// hashSlot returns a consistent slot number between 0 and 16383
+// for any given string key.
+func hashSlot(key string) int {
 	if s := strings.IndexByte(key, '{'); s > -1 {
 		if e := strings.IndexByte(key[s+1:], '}'); e > 0 {
 			key = key[s+1 : s+e+1]
diff --git a/export_test.go b/export_test.go
index 7f7fa67..53519d5 100644
--- a/export_test.go
+++ b/export_test.go
@@ -3,3 +3,7 @@ package redis
 func (c *baseClient) Pool() pool {
 	return c.connPool
 }
+
+func HashSlot(key string) int {
+	return hashSlot(key)
+}