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diff --git a/docs/users_guide/phases.rst b/docs/users_guide/phases.rst
index 8d0c32f5c1..f60ee30709 100644
--- a/docs/users_guide/phases.rst
+++ b/docs/users_guide/phases.rst
@@ -1076,6 +1076,7 @@ for example).
:shortdesc: Use the threaded runtime
:type: dynamic
:category: linking
+ :reverse: -single-threaded
Link the program with the "threaded" version of the runtime system.
The threaded runtime system is so-called because it manages multiple
@@ -1099,6 +1100,16 @@ for example).
called from multiple OS threads simultaneously. See
:ref:`ffi-threads`.
+.. ghc-flag:: -single-threaded
+ :shortdesc: Use the single-threaded runtime
+ :type: dynamic
+ :category: linking
+ :reverse: -threaded
+
+ :since: 9.8
+
+ Switch to the single threaded (default) version of the runtime.
+
.. ghc-flag:: -eventlog
:shortdesc: Enable runtime event tracing
:type: dynamic