+.TP
+\fBsave-target-ratio=\fIratio\fR
+Specifies the target save ratio for the major collector. The collector
+lets a given amount of memory to be promoted from the nursery due to
+minor collections before it triggers a major collection. This amount
+is based on how much memory it expects to free. It is represented as
+a ratio of the size of the heap after a major collection.
+Valid values are between 0.1 and 2.0. The default is 0.5.
+Smaller values will keep the major heap size smaller but will trigger
+more major collections. Likewise, bigger values will use more memory
+and result in less frequent major collections.
+This option is EXPERIMENTAL, so it might disappear in later versions of mono.
+.TP
+\fBdefault-allowance-ratio=\fIratio\fR
+Specifies the default allocation allowance when the calculated size
+is too small. The allocation allowance is how much memory the collector
+let be promoted before triggered a major collection.
+It is a ratio of the nursery size.
+Valid values are between 1.0 and 10.0. The default is 4.0.
+Smaller values lead to smaller heaps and more frequent major collections.
+Likewise, bigger values will allow the heap to grow faster but use
+more memory when it reaches a stable size.
+This option is EXPERIMENTAL, so it might disappear in later versions of mono.
+.TP
+\fBminor=\fIminor-collector\fR
+Specifies which minor collector to use. Options are 'simple' which
+promotes all objects from the nursery directly to the old generation
+and 'split' which lets object stay longer on the nursery before promoting.
+.TP
+\fBalloc-ratio=\fIratio\fR
+Specifies the ratio of memory from the nursery to be use by the alloc space.
+This only can only be used with the split minor collector.
+Valid values are integers between 1 and 100. Default is 60.
+.TP
+\fBpromotion-age=\fIage\fR
+Specifies the required age of an object must reach inside the nursery before
+been promoted to the old generation. This only can only be used with the
+split minor collector.
+Valid values are integers between 1 and 14. Default is 2.