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-rw-r--r--manual/memory.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/manual/memory.texi b/manual/memory.texi
index 5427799294..10ae4dee10 100644
--- a/manual/memory.texi
+++ b/manual/memory.texi
@@ -697,7 +697,8 @@ heap size such that excessive amounts of system calls can be avoided.
All chunks larger than this value are allocated outside the normal
heap, using the @code{mmap} system call. This way it is guaranteed
that the memory for these chunks can be returned to the system on
-@code{free}.
+@code{free}. Note that requests smaller than this threshold might still
+be allocated via @code{mmap}.
@item M_MMAP_MAX
The maximum number of chunks to allocate with @code{mmap}. Setting this
to zero disables all use of @code{mmap}.