diff --git a/doc/v2/stdio.qbk b/doc/v2/stdio.qbk
index b21f6f718..915cdfd2c 100644
--- a/doc/v2/stdio.qbk
+++ b/doc/v2/stdio.qbk
@@ -12,7 +12,7 @@ automatically connected and the other side will get assigned to the child proces
 
 ```
     asio::io_context ctx;
-    asio::readable_pipe rp;
+    asio::readable_pipe rp{ctx};
 
     process proc(ctx, "/usr/bin/g++", {"--version"}, process_stdio{{ /* in to default */}, rp, { /* err to default */ }});
     std::string output;
@@ -86,4 +86,4 @@ It starts a process and connects pipes for stdin and stdout, so that the popen o
 
 [endsect]
 
-[endsect]
\ No newline at end of file
+[endsect]