diff --git a/content/concurrency.article b/content/concurrency.article
index bdde17d..5fd0fcc 100644
--- a/content/concurrency.article
+++ b/content/concurrency.article
@@ -36,6 +36,9 @@
 
 By default, sends and receives block until the other side is ready. This allows goroutines to synchronize without explicit locks or condition variables.
 
+The example code sums the numbers in a slice, distributing the work between two goroutines.
+Once both goroutines have completed their computation, it calculates the final result.
+
 .play concurrency/channels.go
 
 * Buffered Channels