diff --git a/mm/Kconfig b/mm/Kconfig
index a9cb80a..bd80460 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -137,5 +137,11 @@
 # support for page migration
 #
 config MIGRATION
+	bool "Page migration"
 	def_bool y if NUMA || SPARSEMEM || DISCONTIGMEM
 	depends on SWAP
+	help
+	  Allows the migration of the physical location of pages of processes
+	  while the virtual addresses are not changed. This is useful for
+	  example on NUMA systems to put pages nearer to the processors accessing
+	  the page.