diff --git a/man3/mallinfo.3 b/man3/mallinfo.3
index 0cf773882..677a9a1cf 100644
--- a/man3/mallinfo.3
+++ b/man3/mallinfo.3
@@ -37,7 +37,14 @@ function returns a copy of a structure containing information about
 memory allocations performed by
 .BR malloc (3)
 and related functions.
-This structure is defined as follows:
+.PP
+Note that not all allocations are visible to
+.BR mallinfo ();
+see BUGS and consider using
+.BR malloc_info (3)
+instead.
+.PP
+The returned structure is defined as follows:
 .PP
 .in +4n
 .EX