--- libmalloc/libmalloc-409.81.2/man/malloc.3
+++ libmalloc/libmalloc-792.1.1/man/malloc.3
@@ -238,11 +238,15 @@
 .Ev MallocGuardEdges
 environment variable is set.
 .It Ev MallocStackLogging
-The default behavior if this is set is to record all allocation and deallocation events to an on-disk log, along with stacks, so that tools like
+The default behavior when set to 1 is "lite" mode as described below.
+.Pp
+Set to "lite" to record stack traces for current allocations only, without history, so that tools like
 .Xr leaks 1
 and
 .Xr malloc_history 1
-can be used.
+can later use them. These are recorded to in-memory data structures and do not write to the filesystem.
+.Pp
+Set to "full" to record allocation and deallocation events to an on-disk log, along with stacks, for later use by analysis tools. The process must have write access to the pre-existing output directory, which can be specified with MallocStackLoggingDirectory.
 .Pp
 Set to "vm" to record only allocation of virtual memory regions allocated by system calls and mach traps, such as by
 .Xr mmap 1
@@ -252,11 +256,8 @@
 .Xr malloc 3
 and related interfaces, not virtual memory regions.
 .Pp
-Set to "lite" to record current allocations only, not history.   These are recorded by in-memory data structures, instead of an on-disk log.
 .It Ev MallocStackLoggingNoCompact
-If set, record all stacks in a manner that is compatible with the
-.Nm malloc_history
-program.
+If set, implies MallocStackLogging in "full" mode and disables eliding of adjacent malloc/free events operating on the same address.
 .It Ev MallocStackLoggingDirectory
 If set, records stack logs to the directory specified instead of saving them to the default location (/tmp).
 .It Ev MallocScribble