diff --git a/lib/open3.rb b/lib/open3.rb
index 7f68d706e9..01ccbc4a2d 100644
--- a/lib/open3.rb
+++ b/lib/open3.rb
@@ -23,7 +23,7 @@
 # - Open3.pipeline_rw : pipes for first stdin and last stdout of a pipeline
 # - Open3.pipeline_r : pipe for last stdout of a pipeline
 # - Open3.pipeline_w : pipe for first stdin of a pipeline
-# - Open3.pipeline_start : a pipeline
+# - Open3.pipeline_start : run a pipeline and don't wait
 # - Open3.pipeline : run a pipline and wait
 #