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diff --git a/sys/sys/param.h b/sys/sys/param.h
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -54,13 +54,29 @@
*
* documentation/content/en/books/porters-handbook/versions/_index.adoc
*
- * scheme is: <major><two digit minor>Rxx
+ * Encoding: <major><two digit minor>Rxx
* 'R' is in the range 0 to 4 if this is a release branch or
* X.0-CURRENT before releng/X.0 is created, otherwise 'R' is
* in the range 5 to 9.
+ * Short hand: MMmmXXX
+ *
+ * __FreeBSD_version is bumped every time there's a change in the base system
+ * that's noteworthy. A noteworthy change is any change which changes the
+ * kernel's KBI in -CURRENT, one that changes some detail about the system that
+ * external software (or the ports system) would want to know about, one that
+ * adds a system call, one that adds or deletes a shipped library, a secuirty
+ * fix, or similar change not specifically noted here. Bumps should be limited
+ * to one per day / a couple per week except for security fixes.
+ *
+ * The approved way to obtain this from a shell script is:
+ * awk '/^\#define[[:space:]]*__FreeBSD_version/ {print $3}'
+ * Other methods to parse this file may work, but are not guaranteed against
+ * future changes. The above script works back to FreeBSD 3.x when this macro
+ * was introduced. This number is propigated to other places needing it that
+ * cannot include sys/param.h and should only be updated here.
*/
#undef __FreeBSD_version
-#define __FreeBSD_version 1400013 /* Master, propagated to newvers */
+#define __FreeBSD_version 1400013
/*
* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,

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