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-rw-r--r--Help/variable/CMAKE_Swift_LANGUAGE_VERSION.rst8
1 files changed, 6 insertions, 2 deletions
diff --git a/Help/variable/CMAKE_Swift_LANGUAGE_VERSION.rst b/Help/variable/CMAKE_Swift_LANGUAGE_VERSION.rst
index 50121e2..b4a74eb 100644
--- a/Help/variable/CMAKE_Swift_LANGUAGE_VERSION.rst
+++ b/Help/variable/CMAKE_Swift_LANGUAGE_VERSION.rst
@@ -1,5 +1,9 @@
CMAKE_Swift_LANGUAGE_VERSION
----------------------------
-Set to the Swift language version number. If not set, the legacy "2.3"
-version is assumed.
+Set to the Swift language version number. If not set, the oldest legacy
+version known to be available in the host Xcode version is assumed:
+
+* Swift ``4.0`` for Xcode 10.2 and above.
+* Swift ``3.0`` for Xcode 8.3 and above.
+* Swift ``2.3`` for Xcode 8.2 and below.