diff --git a/src/libextra/arc.rs b/src/libextra/arc.rs
index 661224b0a8037..7746e0f06a658 100644
--- a/src/libextra/arc.rs
+++ b/src/libextra/arc.rs
@@ -19,7 +19,7 @@
  *
  * ~~~ {.rust}
  * extern mod std;
- * use std::arc;
+ * use extra::arc;
  * let numbers=vec::from_fn(100, |ind| (ind as float)*rand::random());
  * let shared_numbers=arc::ARC(numbers);
  *
diff --git a/src/libextra/base64.rs b/src/libextra/base64.rs
index 5bf4dd517a5b2..392e7ff29a226 100644
--- a/src/libextra/base64.rs
+++ b/src/libextra/base64.rs
@@ -36,8 +36,8 @@ impl<'self> ToBase64 for &'self [u8] {
      * # Example
      *
      * ~~~ {.rust}
-     * extern mod std;
-     * use std::base64::ToBase64;
+     * extern mod extra;
+     * use extra::base64::ToBase64;
      *
      * fn main () {
      *     let str = [52,32].to_base64();
@@ -99,8 +99,8 @@ impl<'self> ToBase64 for &'self str {
      * # Example
      *
      * ~~~ {.rust}
-     * extern mod std;
-     * use std::base64::ToBase64;
+     * extern mod extra;
+     * use extra::base64::ToBase64;
      *
      * fn main () {
      *     let str = "Hello, World".to_base64();
@@ -127,9 +127,9 @@ impl<'self> FromBase64 for &'self [u8] {
      * # Example
      *
      * ~~~ {.rust}
-     * extern mod std;
-     * use std::base64::ToBase64;
-     * use std::base64::FromBase64;
+     * extern mod extra;
+     * use extra::base64::ToBase64;
+     * use extra::base64::FromBase64;
      *
      * fn main () {
      *     let str = [52,32].to_base64();
@@ -207,9 +207,9 @@ impl<'self> FromBase64 for &'self str {
      * This converts a string literal to base64 and back.
      *
      * ~~~ {.rust}
-     * extern mod std;
-     * use std::base64::ToBase64;
-     * use std::base64::FromBase64;
+     * extern mod extra;
+     * use extra::base64::ToBase64;
+     * use extra::base64::FromBase64;
      * use core::str;
      *
      * fn main () {
diff --git a/src/libextra/future.rs b/src/libextra/future.rs
index 4652e1d647701..030e63adca967 100644
--- a/src/libextra/future.rs
+++ b/src/libextra/future.rs
@@ -17,7 +17,7 @@
  * ~~~ {.rust}
  * # fn fib(n: uint) -> uint {42};
  * # fn make_a_sandwich() {};
- * let mut delayed_fib = std::future::spawn (|| fib(5000) );
+ * let mut delayed_fib = extra::future::spawn (|| fib(5000) );
  * make_a_sandwich();
  * println(fmt!("fib(5000) = %?", delayed_fib.get()))
  * ~~~
diff --git a/src/libextra/net_ip.rs b/src/libextra/net_ip.rs
index 91c357088c98b..718da87af250e 100644
--- a/src/libextra/net_ip.rs
+++ b/src/libextra/net_ip.rs
@@ -55,7 +55,7 @@ pub struct ParseAddrErr {
  *
  * # Arguments
  *
- * * ip - a `std::net::ip::IpAddr`
+ * * ip - a `extra::net::ip::IpAddr`
  */
 pub fn format_addr(ip: &IpAddr) -> ~str {
     match *ip {
@@ -80,7 +80,7 @@ pub fn format_addr(ip: &IpAddr) -> ~str {
  * Get the associated port
  *
  * # Arguments
- * * ip - a `std::net::ip::IpAddr`
+ * * ip - a `extra::net::ip::IpAddr`
  */
 pub fn get_port(ip: &IpAddr) -> uint {
     match *ip {
diff --git a/src/libstd/os.rs b/src/libstd/os.rs
index 59b40b93d4d16..dff72e844bf90 100644
--- a/src/libstd/os.rs
+++ b/src/libstd/os.rs
@@ -1716,5 +1716,5 @@ mod tests {
         assert!(!os::mkdir_recursive(&path, (S_IRUSR | S_IWUSR | S_IXUSR) as i32));
     }
 
-    // More recursive_mkdir tests are in std::tempfile
+    // More recursive_mkdir tests are in extra::tempfile
 }
diff --git a/src/libstd/str.rs b/src/libstd/str.rs
index f3226b27d1be3..33380c9e15062 100644
--- a/src/libstd/str.rs
+++ b/src/libstd/str.rs
@@ -14,7 +14,7 @@
  * Strings are a packed UTF-8 representation of text, stored as null
  * terminated buffers of u8 bytes.  Strings should be indexed in bytes,
  * for efficiency, but UTF-8 unsafe operations should be avoided.  For
- * some heavy-duty uses, try std::rope.
+ * some heavy-duty uses, try extra::rope.
  */
 
 use at_vec;