diff --git a/src/lib.rs b/src/lib.rs
index 01dcf50..9465702 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,3 +11,8 @@ pub mod utils;
 lazy_static::lazy_static! {
     static ref COUNTER: utils::counter::Counter = utils::counter::Counter::new();
 }
+
+/// Returns a reference to the global counter instance.
+pub fn get_counter() -> &'static utils::counter::Counter {
+    &COUNTER
+}
diff --git a/src/scripts/circus/archive/crm.rs b/src/scripts/circus/archive/crm.rs
index d8d69bc..d44b4ac 100644
--- a/src/scripts/circus/archive/crm.rs
+++ b/src/scripts/circus/archive/crm.rs
@@ -1,3 +1,4 @@
+//! Circus Image Archive File (.crm)
 use crate::ext::io::*;
 use crate::scripts::base::*;
 use crate::types::*;
@@ -7,9 +8,11 @@ use std::io::{Read, Seek, SeekFrom};
 use std::sync::{Arc, Mutex};
 
 #[derive(Debug)]
+/// Circus CRM Archive Builder
 pub struct CrmArchiveBuilder {}
 
 impl CrmArchiveBuilder {
+    /// Creates a new instance of `CrmArchiveBuilder`.
     pub fn new() -> Self {
         Self {}
     }
@@ -178,12 +181,18 @@ impl<T: Read + Seek> Seek for Entry<T> {
 }
 
 #[derive(Debug)]
+/// Circus CRM Archive
 pub struct CrmArchive<T: Read + Seek + std::fmt::Debug> {
     reader: Arc<Mutex<T>>,
     entries: Vec<CrmFileHeader>,
 }
 
 impl<T: Read + Seek + std::fmt::Debug> CrmArchive<T> {
+    /// Creates a new `CrmArchive` from a reader.
+    ///
+    /// * `reader` - The reader to read the CRM archive from.
+    /// * `encoding` - The encoding to use for string fields.
+    /// * `config` - Extra configuration options.
     pub fn new(mut reader: T, encoding: Encoding, _config: &ExtraConfig) -> Result<Self> {
         let mut magic = [0u8; 4];
         reader.read_exact(&mut magic)?;
diff --git a/src/scripts/circus/archive/dat.rs b/src/scripts/circus/archive/dat.rs
index d6f4bcb..ff997d1 100644
--- a/src/scripts/circus/archive/dat.rs
+++ b/src/scripts/circus/archive/dat.rs
@@ -1,3 +1,4 @@
+//! Circus Archive File (.dat)
 use crate::ext::io::*;
 use crate::scripts::base::*;
 use crate::types::*;
@@ -6,9 +7,11 @@ use std::io::{Read, Seek, SeekFrom};
 use std::sync::{Arc, Mutex};
 
 #[derive(Debug)]
+/// Circus DAT Archive Builder
 pub struct DatArchiveBuilder {}
 
 impl DatArchiveBuilder {
+    /// Creates a new instance of `DatArchiveBuilder`.
     pub fn new() -> Self {
         Self {}
     }
@@ -174,11 +177,14 @@ impl<T: Read + Seek> Seek for Entry<T> {
 }
 
 #[derive(Debug)]
+/// Extra information for the DAT archive.
 pub struct DatExtraInfo {
+    /// Maximum length of file names in the DAT archive.
     pub name_len: usize,
 }
 
 #[derive(Debug)]
+/// Circus DAT Archive
 pub struct DatArchive<T: Read + Seek + std::fmt::Debug> {
     reader: Arc<Mutex<T>>,
     entries: Vec<DatFileHeader>,
@@ -188,6 +194,11 @@ pub struct DatArchive<T: Read + Seek + std::fmt::Debug> {
 const NAME_LEN: [usize; 3] = [0x24, 0x30, 0x3C];
 
 impl<T: Read + Seek + std::fmt::Debug> DatArchive<T> {
+    /// Creates a new `DatArchive` from a reader.
+    ///
+    /// * `reader` - The reader to read the DAT archive from.
+    /// * `encoding` - The encoding to use for string fields.
+    /// * `config` - Extra configuration options.
     pub fn new(mut reader: T, encoding: Encoding, _config: &ExtraConfig) -> Result<Self> {
         let (name_len, entries) = Self::read_all_index(&mut reader, encoding)?;
         let reader = Arc::new(Mutex::new(reader));
@@ -365,6 +376,9 @@ fn is_this_format_name_len(buf: &[u8], name_len: usize) -> Result<u8> {
     Ok(score)
 }
 
+/// Checks if the buffer is a valid DAT archive format.
+///
+/// * `buf` - The buffer to check.
 pub fn is_this_format(buf: &[u8]) -> Result<u8> {
     for &name_len in &NAME_LEN {
         match is_this_format_name_len(buf, name_len) {
diff --git a/src/scripts/circus/archive/mod.rs b/src/scripts/circus/archive/mod.rs
index 6af54e9..055e566 100644
--- a/src/scripts/circus/archive/mod.rs
+++ b/src/scripts/circus/archive/mod.rs
@@ -1,3 +1,4 @@
+//! Circus Archive
 pub mod crm;
 pub mod dat;
 pub mod pck;
diff --git a/src/scripts/circus/archive/pck.rs b/src/scripts/circus/archive/pck.rs
index 9ff1c5c..6ee3092 100644
--- a/src/scripts/circus/archive/pck.rs
+++ b/src/scripts/circus/archive/pck.rs
@@ -1,3 +1,4 @@
+//! Circus Archive File (.pck/.dat)
 use crate::ext::io::*;
 use crate::scripts::base::*;
 use crate::types::*;
@@ -10,9 +11,11 @@ use std::io::{Read, Seek, SeekFrom, Write};
 use std::sync::{Arc, Mutex};
 
 #[derive(Debug)]
+/// Circus PCK Archive Builder
 pub struct PckArchiveBuilder {}
 
 impl PckArchiveBuilder {
+    /// Creates a new instance of `PckArchiveBuilder`.
     pub const fn new() -> Self {
         Self {}
     }
@@ -193,12 +196,18 @@ impl<T: Read + Seek> Seek for Entry<T> {
 }
 
 #[derive(Debug)]
+/// PCK Archive
 pub struct PckArchive<T: Read + Seek + std::fmt::Debug> {
     reader: Arc<Mutex<T>>,
     entries: Vec<PckFileHeader>,
 }
 
 impl<T: Read + Seek + std::fmt::Debug> PckArchive<T> {
+    /// Creates a new `PckArchive` from a reader.
+    ///
+    /// * `reader` - The reader to read the PCK archive from.
+    /// * `archive_encoding` - The encoding to use for string fields in the archive.
+    /// * `config` - Extra configuration options.
     pub fn new(mut reader: T, archive_encoding: Encoding, _config: &ExtraConfig) -> Result<Self> {
         let file_count = reader.read_u32()?;
         // (offset, size)
@@ -315,6 +324,7 @@ fn detect_script_type(_buf: &[u8], _buf_len: usize, _filename: &str) -> Option<S
     None
 }
 
+/// PCK Archive Writer
 pub struct PckArchiveWriter<T: Write + Seek> {
     writer: T,
     headers: HashMap<String, PckFileHeader>,
@@ -322,6 +332,12 @@ pub struct PckArchiveWriter<T: Write + Seek> {
 }
 
 impl<T: Write + Seek> PckArchiveWriter<T> {
+    /// Creates a new `PckArchiveWriter` for writing a PCK archive.
+    ///
+    /// * `writer` - The writer to write the PCK archive to.
+    /// * `files` - A list of file names to include in the archive.
+    /// * `encoding` - The encoding to use for string fields in the archive.
+    /// * `config` - Extra configuration options.
     pub fn new(
         mut writer: T,
         files: &[&str],
@@ -386,6 +402,7 @@ impl<T: Write + Seek> Archive for PckArchiveWriter<T> {
     }
 }
 
+/// PCK Archive File
 pub struct PckArchiveFile<'a, T: Write + Seek> {
     header: &'a mut PckFileHeader,
     writer: &'a mut T,
@@ -443,6 +460,7 @@ impl<'a, T: Write + Seek> Seek for PckArchiveFile<'a, T> {
     }
 }
 
+/// Checks if the buffer is a valid PCK archive format.
 pub fn is_this_format(buf: &[u8]) -> Result<u8> {
     let mut reader = MemReaderRef::new(buf);
     let count = reader.read_u32()? as usize;
diff --git a/src/scripts/circus/audio/mod.rs b/src/scripts/circus/audio/mod.rs
index fac9bf7..47d7089 100644
--- a/src/scripts/circus/audio/mod.rs
+++ b/src/scripts/circus/audio/mod.rs
@@ -1 +1,2 @@
+//! Circus Audio
 pub mod pcm;
diff --git a/src/scripts/circus/audio/pcm.rs b/src/scripts/circus/audio/pcm.rs
index 5eca444..75b8d38 100644
--- a/src/scripts/circus/audio/pcm.rs
+++ b/src/scripts/circus/audio/pcm.rs
@@ -1,3 +1,4 @@
+//! Circus Audio File (.pcm)
 use crate::ext::io::*;
 use crate::scripts::base::*;
 use crate::types::*;
@@ -10,9 +11,11 @@ use overf::wrapping;
 use std::io::{Read, Seek, Write};
 
 #[derive(Debug)]
+/// Circus PCM Builder
 pub struct PcmBuilder {}
 
 impl PcmBuilder {
+    /// Creates a new instance of `PcmBuilder`.
     pub fn new() -> Self {
         Self {}
     }
@@ -110,12 +113,17 @@ impl Header {
 }
 
 #[derive(Debug)]
+/// Circus PCM Script
 pub struct Pcm {
     header: Header,
     data: MemReader,
 }
 
 impl Pcm {
+    /// Creates a new `Pcm` instance from a reader and configuration.
+    ///
+    /// * `reader` - The reader to read the PCM data from.
+    /// * `config` - Extra configuration options.
     pub fn new<R: Read + Seek>(mut reader: R, _config: &ExtraConfig) -> Result<Self> {
         let mut magic = [0u8; 4];
         reader.read_exact(&mut magic)?;
diff --git a/src/scripts/circus/image/crx.rs b/src/scripts/circus/image/crx.rs
index a2bcc68..6ebd9db 100644
--- a/src/scripts/circus/image/crx.rs
+++ b/src/scripts/circus/image/crx.rs
@@ -1,3 +1,4 @@
+//! Circus Image File (.crx)
 use crate::ext::io::*;
 use crate::scripts::base::*;
 use crate::types::*;
@@ -11,10 +12,15 @@ use overf::wrapping;
 use std::io::{Read, Seek, Write};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+/// Circus CRX Row Encoding Mode
 pub enum CircusCrxMode {
+    /// Encoding all rows with a fixed type.
     Fixed(u8),
+    /// When importing, use origin mode; when creating, use best mode.
     Auto,
+    /// Use origin mode for importing; when creating, fallback to best mode.
     Origin,
+    /// Try to use the best mode for encoding.
     Best,
 }
 
@@ -25,6 +31,7 @@ impl Default for CircusCrxMode {
 }
 
 impl CircusCrxMode {
+    /// Returns mode for importing.
     pub fn for_importing(&self) -> Self {
         match self {
             CircusCrxMode::Auto => CircusCrxMode::Origin,
@@ -32,6 +39,7 @@ impl CircusCrxMode {
         }
     }
 
+    /// Returns mode for creating.
     pub fn for_creating(&self) -> Self {
         match self {
             CircusCrxMode::Auto => CircusCrxMode::Best,
@@ -40,10 +48,12 @@ impl CircusCrxMode {
         }
     }
 
+    /// Checks if the mode is best.
     pub fn is_best(&self) -> bool {
         matches!(self, CircusCrxMode::Best)
     }
 
+    /// Checks if the mode is origin.
     pub fn is_origin(&self) -> bool {
         matches!(self, CircusCrxMode::Origin)
     }
@@ -81,9 +91,11 @@ impl ValueEnum for CircusCrxMode {
 }
 
 #[derive(Debug)]
+/// Circus CRX Image Builder
 pub struct CrxImageBuilder {}
 
 impl CrxImageBuilder {
+    /// Creates a new instance of `CrxImageBuilder`.
     pub const fn new() -> Self {
         CrxImageBuilder {}
     }
@@ -166,6 +178,7 @@ struct Header {
     clips: Vec<Clip>,
 }
 
+/// Circus CRX Image
 pub struct CrxImage {
     header: Header,
     color_type: ImageColorType,
@@ -189,6 +202,10 @@ impl std::fmt::Debug for CrxImage {
 }
 
 impl CrxImage {
+    /// Creates a new `CrxImage` from the given data and configuration.
+    ///
+    /// * `data` - The reader to read the CRX image from.
+    /// * `config` - Extra configuration options.
     pub fn new<T: Read + Seek>(data: T, config: &ExtraConfig) -> Result<Self> {
         let mut reader = data;
         let mut magic = [0; 4];
@@ -241,11 +258,15 @@ impl CrxImage {
         })
     }
 
+    /// Whether to draw image on canvas if canvas's width and height are specified in image.
     pub fn with_canvas(mut self, canvas: bool) -> Self {
         self.canvas = canvas;
         self
     }
 
+    /// Draws another image on this image.
+    ///
+    /// Returns a new `ImageData` with the combined image.
     pub fn draw_diff(&self, diff: &Self) -> Result<ImageData> {
         let base_header = &self.header;
         let diff_header = &diff.header;
@@ -703,6 +724,11 @@ impl CrxImage {
         Ok(dst)
     }
 
+    /// Creates a CRX image file from the given image data and writes it to the specified writer.
+    ///
+    /// * `data` - The input image data.
+    /// * `writer` - The writer to write the CRX image to.
+    /// * `config` - Extra configuration options.
     pub fn create_image<T: Write + Seek>(
         mut data: ImageData,
         mut writer: T,
diff --git a/src/scripts/circus/image/crxd.rs b/src/scripts/circus/image/crxd.rs
index e68137b..070c76f 100644
--- a/src/scripts/circus/image/crxd.rs
+++ b/src/scripts/circus/image/crxd.rs
@@ -1,3 +1,4 @@
+//! Circus Differential Image File (.crx)
 use super::crx::CrxImage;
 use crate::ext::io::*;
 use crate::scripts::base::*;
@@ -6,9 +7,11 @@ use anyhow::Result;
 use std::io::{Read, Seek};
 
 #[derive(Debug)]
+/// Circus CRXD Image Builder
 pub struct CrxdImageBuilder {}
 
 impl CrxdImageBuilder {
+    /// Creates a new instance of `CrxdImageBuilder`.
     pub fn new() -> Self {
         Self {}
     }
@@ -58,12 +61,20 @@ impl ScriptBuilder for CrxdImageBuilder {
 }
 
 #[derive(Debug)]
+/// Circus CRXD Image
 pub struct CrxdImage {
     base: CrxImage,
     diff: CrxImage,
 }
 
 impl CrxdImage {
+    /// Creates a new `CrxdImage` from the given data and configuration.
+    ///
+    /// * `data` - The reader to read the CRXD image from.
+    /// * `filename` - The name of the file to read.
+    /// * `encoding` - The encoding to use for string fields.
+    /// * `config` - Extra configuration options.
+    /// * `archive` - Optional archive to read the image from.
     pub fn new<T: Read + Seek>(
         data: T,
         filename: &str,
diff --git a/src/scripts/circus/image/mod.rs b/src/scripts/circus/image/mod.rs
index 292923c..20caf31 100644
--- a/src/scripts/circus/image/mod.rs
+++ b/src/scripts/circus/image/mod.rs
@@ -1,2 +1,3 @@
+//! Circus Image
 pub mod crx;
 pub mod crxd;
diff --git a/src/scripts/circus/mod.rs b/src/scripts/circus/mod.rs
index 98c00ff..7ff273d 100644
--- a/src/scripts/circus/mod.rs
+++ b/src/scripts/circus/mod.rs
@@ -1,3 +1,4 @@
+//! Circus Scripts
 #[cfg(feature = "circus-arc")]
 pub mod archive;
 #[cfg(feature = "circus-audio")]
diff --git a/src/scripts/circus/script.rs b/src/scripts/circus/script.rs
index 39bccf6..cc2323d 100644
--- a/src/scripts/circus/script.rs
+++ b/src/scripts/circus/script.rs
@@ -1,3 +1,4 @@
+//! Circus Script File (.mes)
 use super::info::*;
 use crate::scripts::base::*;
 use crate::types::*;
@@ -5,9 +6,11 @@ use crate::utils::encoding::{decode_to_string, encode_string};
 use anyhow::Result;
 
 #[derive(Debug)]
+/// Circus MES Script Builder
 pub struct CircusMesScriptBuilder {}
 
 impl CircusMesScriptBuilder {
+    /// Creates a new instance of `CircusMesScriptBuilder`.
     pub const fn new() -> Self {
         CircusMesScriptBuilder {}
     }
@@ -46,6 +49,7 @@ struct Token {
     value: u8,
 }
 
+/// Circus MES Script
 pub struct CircusMesScript {
     data: Vec<u8>,
     encoding: Encoding,
@@ -58,6 +62,11 @@ pub struct CircusMesScript {
 }
 
 impl CircusMesScript {
+    /// Creates a new `CircusMesScript` from the given data and configuration.
+    ///
+    /// * `data` - The data to read the MES script from.
+    /// * `encoding` - The encoding to use for string fields.
+    /// * `config` - Extra configuration options.
     pub fn new(data: Vec<u8>, encoding: Encoding, config: &ExtraConfig) -> Result<Self> {
         let head0 = i32::from_le_bytes(data[0..4].try_into()?);
         let head1 = i32::from_le_bytes(data[4..8].try_into()?);