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diff --git a/sys/vm/vm_object.h b/sys/vm/vm_object.h
--- a/sys/vm/vm_object.h
+++ b/sys/vm/vm_object.h
@@ -197,8 +197,9 @@
#define OBJ_SPLIT 0x00000400 /* object is being split */
#define OBJ_COLLAPSING 0x00000800 /* Parent of collapse. */
#define OBJ_COLORED 0x00001000 /* pg_color is defined */
-#define OBJ_ONEMAPPING 0x00002000 /* One USE (a single, non-forked)
- mapping flag */
+#define OBJ_ONEMAPPING 0x00002000 /* Each page is allowed to have at most
+ one managed mapping, all in the same
+ vm_map */
#define OBJ_PAGERPRIV1 0x00004000 /* Pager private */
#define OBJ_PAGERPRIV2 0x00008000 /* Pager private */
#define OBJ_SYSVSHM 0x00010000 /* SysV SHM */

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