diff --git a/lib/libc/sys/getrlimit.2 b/lib/libc/sys/getrlimit.2
index a946f5b..a92c820 100644
--- a/lib/libc/sys/getrlimit.2
+++ b/lib/libc/sys/getrlimit.2
@@ -62,6 +62,14 @@ The
 .Fa resource
 parameter is one of the following:
 .Bl -tag -width RLIMIT_FSIZEAA
+.It Li RLIMIT_AS
+The maximum size (in bytes) of a process' total available memory.
+If this limit is exceeded, the
+.Xr malloc 3
+and
+.Xr mmap 2 functions will fail and errno set to
+.Dv ENOMEM .
+Moreover, the automatic stack growth will fail as well.
 .It Li RLIMIT_CORE
 The largest size (in bytes)
 .Xr core 5
diff --git a/sys/sys/resource.h b/sys/sys/resource.h
index 03b152e..22fe842 100644
--- a/sys/sys/resource.h
+++ b/sys/sys/resource.h
@@ -95,6 +95,7 @@ struct	rusage {
 #define	RLIMIT_NOFILE	8		/* number of open files */
 #define	RLIMIT_SBSIZE	9		/* maximum size of all socket buffers */
 #define	RLIMIT_VMEM	10		/* virtual process size (inclusive of mmap) */
+#define	RLIMIT_AS       RLIMIT_VMEM     /* standard name for address space size */
 #define	RLIMIT_POSIXLOCKS 11		/* maximum number of POSIX locks per user */
 
 #define	RLIM_NLIMITS	12		/* number of resource limits */