diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index 3170ae05da2..824905ba93f 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -53,6 +53,7 @@ New Features
       test names and if there is a match then that test's property will be
       set to DISABLED. HDF5_DISABLE_TESTS_REGEX can be initialized on the
       command line: "-DHDF5_DISABLE_TESTS_REGEX:STRING=<regex>"
+      See CMake documentation for regex-specification.
 
     - Added defaults to CMake for long double conversion checks