diff --git a/root/etc/sysctl.d/90-vm-map-count.conf b/root/etc/sysctl.d/90-vm-map-count.conf
index 45f2f1a..d6119c5 100644
--- a/root/etc/sysctl.d/90-vm-map-count.conf
+++ b/root/etc/sysctl.d/90-vm-map-count.conf
@@ -1 +1,4 @@
+# Maximum number of memory pages a process may have.
+# Increase this as some programs, particularly malloc debuggers
+# may consume a lot more than the default (65530)
 vm.max_map_count=2147483642
diff --git a/root/etc/sysctl.d/90-vm-swappiness.conf b/root/etc/sysctl.d/90-vm-swappiness.conf
index 51c6fc3..86068d4 100644
--- a/root/etc/sysctl.d/90-vm-swappiness.conf
+++ b/root/etc/sysctl.d/90-vm-swappiness.conf
@@ -1 +1,4 @@
+# How much memory swapping should be done (0-100)
+# A low value means the kernel will avoid swapping as much as possible.
+# We decrease this as with SSDs, swapping can decrease lifetime, only swap when really needed (default: 60)
 vm.swappiness=10