diff --git a/src/README.txt b/src/README.txt
index 92312c6a9fa..c8029098cfa 100644
--- a/src/README.txt
+++ b/src/README.txt
@@ -17,6 +17,7 @@ rt/sync            - Concurrency utils
 rt/util            - Small utility classes for the runtime.
 rt/vg              - Valgrind headers
 rt/msvc            - MSVC support
+rt/linenoise       - a readline-like line editing library
 
 test/              Testsuite
 test/compile-fail  - Tests that should fail to compile