diff --git a/kernel_config_fragment b/kernel_config_fragment
index f71a22d..89e4306 100644
--- a/kernel_config_fragment
+++ b/kernel_config_fragment
@@ -6,13 +6,19 @@ CONFIG_DEBUG_INFO=y
 CONFIG_DEBUG_KERNEL=y
 CONFIG_GDB_SCRIPTS=y
 
-# grep lkmc_dep /proc/kallsyms
+# Non-static variables show up on /proc/kallsyms
+# https://stackoverflow.com/questions/20196636/does-kallsyms-have-all-the-symbol-of-kernel-functions/44614878#44614878
 CONFIG_KALLSYMS_ALL=y
 
 # zcat /proc/config.gz
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 
+# TODO make example.
+# This seems to allow userspace to create arbitrary configuration trees,
+# which kernel modules can then read and interpret.
+CONFIG_CONFIGFS_FS=y
+
 # KGDB
 CONFIG_CONSOLE_POLL=y
 CONFIG_KDB_CONTINUE_CATASTROPHIC=0