diff --git a/README.md b/README.md
index b69bc2d..fc679ba 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 `//redo` redo what was just undone<br/>
 `//show_journal` view what can be undone and redone
 
+The changes of nodes after invoking /set are compressed to improve memory usage.
+
 Related issues:
 * https://github.com/Uberi/Minetest-WorldEdit/issues/43
 * https://forum.minetest.net/viewtopic.php?p=296543#p296543
@@ -23,10 +25,8 @@ Ignored chatcommands:
 
 TODO:
 * simplify mem_usage
-* Setting for disabling storing harmless things like pos changes
 * Add parameters to undo and redo: undo the last n
 * Allow undoing changes which happened before other changes (considered unsafe)
 	e.g. //undo ~1 to undo the change before the latest one
 * Implement more commands
 * Add mod load time info
-* Add settingtypes.txt for the settings
diff --git a/init.lua b/init.lua
index 17718d1..84eeeb7 100644
--- a/init.lua
+++ b/init.lua
@@ -2,10 +2,13 @@
 
 ----------------- Settings -----------------------------------------------------
 
-local max_commands = 256
-local min_commands = 3
-local max_memory_usage = 2^25 -- 32 MiB
-local remember_innocuous = true
+local remember_innocuous =
+	minetest.settings:get_bool"we_undo.remember_innocuous" ~= false
+local max_commands = tonumber(
+	minetest.settings:get"we_undo.max_commands") or 256
+local min_commands = tonumber(minetest.settings:get"we_undo.min_commands") or 3
+local max_memory_usage = tonumber(
+	minetest.settings:get"we_undo.max_memory_usage") or 2^25
 
 
 ----------------- Journal and chatcommands -------------------------------------
diff --git a/settingtypes.txt b/settingtypes.txt
new file mode 100644
index 0000000..0671dde
--- /dev/null
+++ b/settingtypes.txt
@@ -0,0 +1,19 @@
+#    If set to false, only commands which can harm the map are added to the
+#    journal.
+we_undo.remember_innocuous (remember innocuous changes) bool true
+
+#    This is the maximum amount of commands in the journal of a player.
+#    The size of the journal is further limited by the memory setting.
+we_undo.max_commands (maximum count of commands) int 256 1
+
+#    This is the minimum amount of commands in the journal of a player.
+#    The memory limit is ignored up to the last min_commands commands.
+#    This is because being unable to undo a big mistake is worse than exceeding
+#    the configured memory limit.
+we_undo.min_commands (minimum count of commands) int 3 1
+
+#    If the size of the journal exceeds this limit, old history is removed.
+#    Specify the value in bytes, note that it only considers big data,
+#    approximately.
+#    default value: 2^25 (32 MiB)
+we_undo.max_memory_usage (maximum memory usage) int 33554432 9