diff --git a/doc/2-interface/export.md b/doc/2-interface/export.md
index e924a1717..4009df9d8 100644
--- a/doc/2-interface/export.md
+++ b/doc/2-interface/export.md
@@ -53,7 +53,7 @@ the following settings exist:
   - due to VGM format limitations, you can only select up to two of each chip type.
   - some chips will not be available, either because VGM doesn't support these yet, or because you selected an old format version.
 
-## export ZSM
+## ZSM
 
 ZSM (ZSound Music) is a format designed for the Commander X16 to allow hardware playback.
 it may contain data for either YM2151 or VERA chips.
@@ -67,17 +67,17 @@ the following settings are available:
 - **loop**: enables loop. if disabled, the song won't loop.
 - **optimize size**: removes unnecessary commands to reduce size.
 
-## export text
+## Text
 
 this option allows you to export your song as a text file.
 
-## export command stream
+## Command Stream
 
 this option exports a binary file in Furnace's own command stream format (FCS) which contains a dump of the internal command stream produced when playing the song.
 
 it's not really useful, unless you're a developer and want to use a command stream dump for some reason (e.g. writing a hardware sound driver). see `export-tech.md` in `papers/` for details.
 
-## export DMF
+## DMF
 
 this option allows you to save your song as a .dmf which can be opened in DefleMask.
 
diff --git a/doc/2-interface/settings.md b/doc/2-interface/settings.md
index eadbf55a9..cfe12c949 100644
--- a/doc/2-interface/settings.md
+++ b/doc/2-interface/settings.md
@@ -2,7 +2,8 @@
 
 the Settings window allows you to change Furnace settings.
 
-settings are saved when clicking the **OK** or **Apply** buttons at the bottom of the window.
+settings are saved when clicking the **OK** or **Apply** buttons at the bottom of the window, and when closing the program. several backups are kept in the Furnace settings directory.
+
 
 ## General
 
@@ -11,8 +12,8 @@ settings are saved when clicking the **OK** or **Apply** buttons at the bottom o
 - **Language**: select the language used for the interface. some languages are incomplete, and are listed with their approximate completion percentage.
 - **Render backend**: changing this may help with performace or compatibility issues. the available render backends are:
   - SDL Renderer: this was the only available render backend prior to the addition of dedicated OpenGL/DirectX backends in 0.6. default on macOS.
-  - DirectX 11: works with the majority of graphics chips/cards and is optimized specifically for Windows.
     - it is slower than the other backends.
+  - DirectX 11: works with the majority of graphics chips/cards and is optimized specifically for Windows.
   - DirectX 9: use if your hardware is incompatible with DirectX 11.
   - OpenGL 3.0: works with the majority of graphics chips/cards (from 2010 onwards). default on Linux.
   - OpenGL 2.0: use if you have a card without OpenGL 3.0 support.
@@ -54,7 +55,9 @@ settings are saved when clicking the **OK** or **Apply** buttons at the bottom o
   - **Remember last values**
 - **Store instrument name in .fui**: when enabled, saving an instrument will store its name. this may increase file size.
 - **Load instrument name from .fui**: when enabled, loading an instrument will use the stored name (if present). otherwise, it will use the file name.
-- **Auto-fill file name when saving**: pre-fill the file name field with an appropriate name when saving or exporting.
+- **Auto-fill file name when saving**: pre-fill the file name field when saving or exporting.
+  - when saving a module, the existing file name will be auto-filled.
+  - when saving an instrument or sample, its name will be auto-filled.
 
 ### New Song
 
@@ -88,7 +91,7 @@ settings are saved when clicking the **OK** or **Apply** buttons at the bottom o
 ### Configuration
 - **Import**: select an exported `.ini` config file to overwrite current settings.
 - **Export**: select an `.ini` file to save current settings.
-- **Factory Reset**: resets all settings to default.
+- **Factory Reset**: resets all settings to default and purges settings backups.
 
 ## Audio
 
@@ -575,12 +578,12 @@ below all the binds, select a key from the dropdown list to add it. it will appe
 
 - **Enable backup system**: turn on automatic backups of the current open file.
 - **Interval (in seconds)**: time between automatic backups.
-- **Backups per file**: maximum number of backups to store for each file.
+- **Backups per file**: maximum number of backups to store for each file. oldest backups are deleted first.
 
 ### Backup Management
 
 - **Purge before**:
-  - **Go**: purge backups whose filenames precede the selected date.
+  - **Go**: purge all backups from before the selected date.
 - total space used by all backups:
   - **Refresh**: recalculate space.
   - **Delete All**: purge all backups.
diff --git a/doc/2-interface/song-info.md b/doc/2-interface/song-info.md
index 1e10663a3..f9773807c 100644
--- a/doc/2-interface/song-info.md
+++ b/doc/2-interface/song-info.md
@@ -3,7 +3,7 @@
 - **Name**: the track's title.
 - **Author**: the author(s) of this track.
 - **Album**: the associated album name (or the name of the game the song is from).
-- **System**: the game console or computer the track is designed for. this is automatically set when creating a new tune, but can be changed to anything. the **Auto** button will provide a guess based on the chips in use.
+- **System**: the name of the game console or computer the track is designed for. this is automatically set when creating a new tune, but can be changed to anything. the **Auto** button will provide a guess based on the chips in use.
 
 all of this metadata will be included in a VGM export. this isn't the case for an audio export, however.