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-rw-r--r--docs/conf.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/conf.py b/docs/conf.py
index 248ff8cf5d..f892a6e1da 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -136,6 +136,10 @@ if micro >= 50:
     else:
         minor += 1
 
+# These thresholds must match the constants
+# MACHINE_VER_DELETION_MAJOR  & MACHINE_VER_DEPRECATION_MAJOR
+# defined in include/hw/boards.h and the introductory text in
+# docs/about/deprecated.rst
 ver_machine_deprecation_version = "%d.%d.0" % (major - 3, minor)
 ver_machine_deletion_version = "%d.%d.0" % (major - 6, minor)