diff --git a/crates/typos/src/dict.rs b/crates/typos/src/dict.rs
index 7c92d5b..971ca86 100644
--- a/crates/typos/src/dict.rs
+++ b/crates/typos/src/dict.rs
@@ -1,5 +1,34 @@
 use std::borrow::Cow;
 
+/// Look up the validity of a term.
+pub trait Dictionary: Send + Sync {
+    /// Look up the validity of an Identifier.
+    ///
+    /// `None` if the status is unknown.
+    fn correct_ident<'s, 'w>(&'s self, ident: crate::tokens::Identifier<'w>) -> Option<Status<'s>>;
+
+    /// Look up the validity of a Word.
+    ///
+    /// `None` if the status is unknown.
+    fn correct_word<'s, 'w>(&'s self, word: crate::tokens::Word<'w>) -> Option<Status<'s>>;
+}
+
+pub(crate) struct NullDictionary;
+
+impl Dictionary for NullDictionary {
+    fn correct_ident<'s, 'w>(
+        &'s self,
+        _ident: crate::tokens::Identifier<'w>,
+    ) -> Option<Status<'s>> {
+        None
+    }
+
+    fn correct_word<'s, 'w>(&'s self, _word: crate::tokens::Word<'w>) -> Option<Status<'s>> {
+        None
+    }
+}
+
+/// Validity of a term in a Dictionary.
 #[derive(Clone, PartialEq, Eq, Debug, serde::Serialize)]
 #[serde(rename_all = "snake_case")]
 #[serde(untagged)]
@@ -54,25 +83,3 @@ impl<'c> Status<'c> {
         }
     }
 }
-
-pub trait Dictionary: Send + Sync {
-    fn correct_ident<'s, 'w>(&'s self, _ident: crate::tokens::Identifier<'w>)
-        -> Option<Status<'s>>;
-
-    fn correct_word<'s, 'w>(&'s self, word: crate::tokens::Word<'w>) -> Option<Status<'s>>;
-}
-
-pub(crate) struct NullDictionary;
-
-impl Dictionary for NullDictionary {
-    fn correct_ident<'s, 'w>(
-        &'s self,
-        _ident: crate::tokens::Identifier<'w>,
-    ) -> Option<Status<'s>> {
-        None
-    }
-
-    fn correct_word<'s, 'w>(&'s self, _word: crate::tokens::Word<'w>) -> Option<Status<'s>> {
-        None
-    }
-}
diff --git a/crates/typos/src/parser.rs b/crates/typos/src/parser.rs
index 95d0d4c..ae23bfd 100644
--- a/crates/typos/src/parser.rs
+++ b/crates/typos/src/parser.rs
@@ -15,11 +15,13 @@ impl<'p> ParserBuilder<'p, 'static> {
 }
 
 impl<'p, 'd> ParserBuilder<'p, 'd> {
+    /// Set the Tokenizer used when parsing.
     pub fn tokenizer(mut self, tokenizer: &'p tokens::Tokenizer) -> Self {
         self.tokenizer = Some(tokenizer);
         self
     }
 
+    /// Set the dictionary used when parsing.
     pub fn dictionary<'d1>(self, dictionary: &'d1 dyn Dictionary) -> ParserBuilder<'p, 'd1> {
         ParserBuilder {
             tokenizer: self.tokenizer,
@@ -27,6 +29,7 @@ impl<'p, 'd> ParserBuilder<'p, 'd> {
         }
     }
 
+    /// Extract typos from the buffer.
     pub fn typos(&self) -> TyposParser<'p, 'd> {
         TyposParser {
             tokenizer: self.tokenizer.unwrap_or_else(|| &DEFAULT_TOKENIZER),
@@ -34,12 +37,14 @@ impl<'p, 'd> ParserBuilder<'p, 'd> {
         }
     }
 
+    /// Parse for Identifiers.
     pub fn identifiers(&self) -> IdentifiersParser<'p> {
         IdentifiersParser {
             tokenizer: self.tokenizer.unwrap_or_else(|| &DEFAULT_TOKENIZER),
         }
     }
 
+    /// Parse for Words.
     pub fn words(&self) -> WordsParser<'p> {
         WordsParser {
             tokenizer: self.tokenizer.unwrap_or_else(|| &DEFAULT_TOKENIZER),
@@ -59,6 +64,7 @@ impl<'p> Default for ParserBuilder<'p, 'static> {
 static DEFAULT_TOKENIZER: once_cell::sync::Lazy<tokens::Tokenizer> =
     once_cell::sync::Lazy::new(|| tokens::Tokenizer::new());
 
+/// Extract typos from the buffer.
 #[derive(Clone)]
 pub struct TyposParser<'p, 'd> {
     tokenizer: &'p tokens::Tokenizer,
@@ -116,6 +122,7 @@ impl<'p, 'd> TyposParser<'p, 'd> {
     }
 }
 
+/// An invalid term found in the buffer.
 #[derive(Clone, Debug)]
 #[non_exhaustive]
 pub struct Typo<'m> {
@@ -152,6 +159,7 @@ impl<'m> Default for Typo<'m> {
     }
 }
 
+/// Parse for Identifiers.
 #[derive(Debug, Clone)]
 pub struct IdentifiersParser<'p> {
     tokenizer: &'p tokens::Tokenizer,
@@ -167,6 +175,7 @@ impl<'p> IdentifiersParser<'p> {
     }
 }
 
+/// Parse for Words.
 #[derive(Debug, Clone)]
 pub struct WordsParser<'p> {
     tokenizer: &'p tokens::Tokenizer,
diff --git a/crates/typos/src/tokens.rs b/crates/typos/src/tokens.rs
index f372c96..3f5aefc 100644
--- a/crates/typos/src/tokens.rs
+++ b/crates/typos/src/tokens.rs
@@ -1,3 +1,4 @@
+/// Define rules for tokenizaing a buffer.
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct TokenizerBuilder {
     ignore_hex: bool,
@@ -12,26 +13,31 @@ impl TokenizerBuilder {
         Default::default()
     }
 
+    /// Specify that hexadecimal numbers should be ignored.
     pub fn ignore_hex(&mut self, yes: bool) -> &mut Self {
         self.ignore_hex = yes;
         self
     }
 
+    /// Specify that leading digits are allowed for Identifiers.
     pub fn leading_digits(&mut self, yes: bool) -> &mut Self {
         self.leading_digits = yes;
         self
     }
 
+    /// Extend accepted leading characters for Identifiers.
     pub fn leading_chars(&mut self, chars: String) -> &mut Self {
         self.leading_chars = chars;
         self
     }
 
+    /// Specify that digits can be included in Identifiers.
     pub fn include_digits(&mut self, yes: bool) -> &mut Self {
         self.include_digits = yes;
         self
     }
 
+    /// Extend accepted characters for Identifiers.
     pub fn include_chars(&mut self, chars: String) -> &mut Self {
         self.include_chars = chars;
         self
@@ -81,6 +87,7 @@ impl Default for TokenizerBuilder {
     }
 }
 
+/// Extract Identifiers from a buffer.
 #[derive(Debug, Clone)]
 pub struct Tokenizer {
     words_str: regex::Regex,
@@ -148,6 +155,7 @@ fn is_hex(ident: &[u8]) -> bool {
     HEX.is_match(ident)
 }
 
+/// A term composed of Words.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct Identifier<'t> {
     token: &'t str,
@@ -171,11 +179,13 @@ impl<'t> Identifier<'t> {
         self.offset
     }
 
+    /// Split into individual Words.
     pub fn split(&self) -> impl Iterator<Item = Word<'t>> {
         split_ident(self.token, self.offset)
     }
 }
 
+/// An indivisible term.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct Word<'t> {
     token: &'t str,
@@ -325,6 +335,7 @@ impl<'s> Iterator for SplitIdent<'s> {
     }
 }
 
+/// Format of the term.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum Case {
     Title,