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diff --git a/content.tex b/content.tex
index 2e75b5e..7fa9a65 100644
--- a/content.tex
+++ b/content.tex
@@ -4513,6 +4513,8 @@ struct virtio_balloon_stat {
#define VIRTIO_BALLOON_S_MINFLT 3
#define VIRTIO_BALLOON_S_MEMFREE 4
#define VIRTIO_BALLOON_S_MEMTOT 5
+#define VIRTIO_BALLOON_S_AVAIL 6
+#define VIRTIO_BALLOON_S_CACHES 7
le16 tag;
le64 val;
} __attribute__((packed));
@@ -4594,6 +4596,13 @@ first buffer.
\item[VIRTIO_BALLOON_S_MEMTOT (5)] The total amount of memory available
(in bytes).
+
+\item[VIRTIO_BALLOON_S_AVAIL (6)] An estimate of how much memory is available
+ (in bytes) for starting new applications, without pushing the system to swap.
+
+\item[VIRTIO_BALLOON_S_CACHES (7)] The amount of memory, in bytes, that can be
+ quickly reclaimed without additional I/O. Typically these pages are used for
+ caching files from disk.
\end{description}
\section{SCSI Host Device}\label{sec:Device Types / SCSI Host Device}