diff --git a/doc/shell.rs b/doc/shell.rs
index 2f42364a..f085156c 100644
--- a/doc/shell.rs
+++ b/doc/shell.rs
@@ -30,7 +30,7 @@ fn main() {
             // types. By default the underlying file is line buffered. This
             // will allow us to process history, syntax, and more!
 
-            // Read what's avalible to us.
+            // Read what's available to us.
             stdin.read(&mut input).expect("error reading STDIN");
 
             // Once we've read a complete "program" (§2.10.2) we handle it,
diff --git a/src/program/posix/lex.rs b/src/program/posix/lex.rs
index 8132812e..10b79ee2 100644
--- a/src/program/posix/lex.rs
+++ b/src/program/posix/lex.rs
@@ -20,7 +20,7 @@ pub enum Error {
     UnrecognizedChar(usize, char, usize),
 }
 
-/// Every token in the langauge, these are the terminals of the grammar.
+/// Every token in the language, these are the terminals of the grammar.
 #[derive(Eq, PartialEq, Clone, Debug)]
 pub enum Token<'input> {
     Space,
@@ -71,7 +71,7 @@ pub enum Token<'input> {
     Text(&'input str),
 }
 
-/// A lexer to feed the parser gernerated by LALRPOP.
+/// A lexer to feed the parser generated by LALRPOP.
 pub struct Lexer<'input> {
     /// The original text.
     input: &'input str,
@@ -265,7 +265,7 @@ impl<'input> Lexer<'input> {
     fn single_quote(&mut self, start: usize, end: usize)
         -> Result<(usize, Token<'input>, usize), Error>
     {
-        // TODO: This quitely stops at EOF.
+        // TODO: This quietly stops at EOF.
         let (_, end) = self.take_while(start, end, |c| c != '\'');
         self.advance();  // Consume the ending single quote.
         Ok((start, Token::Word(&self.input[start+1..end]), end))
@@ -276,7 +276,7 @@ impl<'input> Lexer<'input> {
     fn double_quote(&mut self, start: usize, end: usize)
         -> Result<(usize, Token<'input>, usize), Error>
     {
-        // TODO: This quitely stops at EOF.
+        // TODO: This quietly stops at EOF.
         let (input, end) = self.take_while(start, end, |c| c != '"');
         self.advance();  // Consume the ending double quote.
         Ok((start, Token::Word(&input[1..]), end))
@@ -326,7 +326,7 @@ impl<'input> Lexer<'input> {
                 self.advance();  // Consume the '#'.
                 if let Some((_, '!', s)) = self.lookahead {
                     let (_, end) = self.take_until(s, end, |c| c == ';');
-                    self.advance();  // Consume the ';' delimeter.
+                    self.advance();  // Consume the ';' delimiter.
                     self.take_while(end, end, |c| c.is_whitespace());
                     self.in_shebang = true;
 
diff --git a/src/program/posix/mod.rs b/src/program/posix/mod.rs
index 4f3349b8..12364c36 100644
--- a/src/program/posix/mod.rs
+++ b/src/program/posix/mod.rs
@@ -50,7 +50,7 @@
 //! ```
 //!
 //! Variables are loaded from the environment (often simply called `ENV`) as
-//! well. For more information on the enviroment read
+//! well. For more information on the environment read
 //! [section 8.1](http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html).
 //!
 //! ```sh
diff --git a/src/repl/completion.rs b/src/repl/completion.rs
index a568c1ad..b98879cc 100644
--- a/src/repl/completion.rs
+++ b/src/repl/completion.rs
@@ -1,4 +1,4 @@
-//! User text completion for REPL interations.
+//! User text completion for REPL inputs.
 //!
 //! Simple use cases for this module should be as easy as the following
 //! example taken from the current REPL.
@@ -62,7 +62,7 @@ impl Completion {
         }
     }
 
-    /// Return a list of all the possibile complete matches.
+    /// Return a list of all the possible complete matches.
     pub fn possibilities(&self) -> Vec<String> {
         match *self {
             Completion::None => vec![],
diff --git a/src/repl/mod.rs b/src/repl/mod.rs
index 18616d8c..227158bd 100644
--- a/src/repl/mod.rs
+++ b/src/repl/mod.rs
@@ -66,7 +66,7 @@ fn raw_loop(stdin: Stdin, stdout: Stdout, io: &mut IO, jobs: &mut Jobs, args: &m
     let mut stdout = stdout.into_raw_mode()
         .expect("error opening raw mode");
 
-    // Display the inital prompt.
+    // Display the initial prompt.
     prompt::ps1(&mut stdout);
 
     // XXX: Hack to get the prompt length.
@@ -113,7 +113,7 @@ fn raw_loop(stdin: Stdin, stdout: Stdout, io: &mut IO, jobs: &mut Jobs, args: &m
 
 #[cfg(not(feature = "raw"))]
 fn buffered_loop(stdin: Stdin, mut stdout: Stdout, io: &mut IO, jobs: &mut Jobs, args: &mut ArgvMap) {
-    // Display the inital prompt.
+    // Display the initial prompt.
     prompt::ps1(&mut stdout);
 
     for line in stdin.lock().lines() {