fix doc typo
diff --git a/groupcache.go b/groupcache.go
index ca25fe0..637b063 100644
--- a/groupcache.go
+++ b/groupcache.go
@@ -157,7 +157,7 @@
 	// a hotCache avoids network hotspotting, where a peer's
 	// network card could become the bottleneck on a popular key.
 	// This cache is used sparingly to maximize the total number
-	// of key/value pairs that can stored globally.
+	// of key/value pairs that can be stored globally.
 	hotCache cache
 
 	// loadGroup ensures that each key is only fetched once