diff --git a/src/libcollections/str.rs b/src/libcollections/str.rs
index a30ec452e3c15..5789cd8edfc09 100644
--- a/src/libcollections/str.rs
+++ b/src/libcollections/str.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Unicode string slices
+//! Unicode string slices.
 //!
 //! *[See also the `str` primitive type](../primitive.str.html).*
 
diff --git a/src/libcore/clone.rs b/src/libcore/clone.rs
index 769faedf46e8e..b1f63ad71ca37 100644
--- a/src/libcore/clone.rs
+++ b/src/libcore/clone.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! The `Clone` trait for types that cannot be 'implicitly copied'
+//! The `Clone` trait for types that cannot be 'implicitly copied'.
 //!
 //! In Rust, some simple types are "implicitly copyable" and when you
 //! assign them or pass them as arguments, the receiver will get a copy,
diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index a3b09e9db42d1..6cc3b4e01b865 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Utilities for formatting and printing strings
+//! Utilities for formatting and printing strings.
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/iter.rs b/src/libcore/iter.rs
index d6bd9dbf4bde2..0e65a79e347a0 100644
--- a/src/libcore/iter.rs
+++ b/src/libcore/iter.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Composable external iteration
+//! Composable external iteration.
 //!
 //! If you've found yourself with a collection of some kind, and needed to
 //! perform an operation on the elements of said collection, you'll quickly run
diff --git a/src/libcore/mem.rs b/src/libcore/mem.rs
index c36ad592ad3b5..2c648d1516bff 100644
--- a/src/libcore/mem.rs
+++ b/src/libcore/mem.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Basic functions for dealing with memory
+//! Basic functions for dealing with memory.
 //!
 //! This module contains functions for querying the size and alignment of
 //! types, initializing and manipulating memory.
diff --git a/src/libcore/ops.rs b/src/libcore/ops.rs
index 0f5584a952f54..25df9c90578a5 100644
--- a/src/libcore/ops.rs
+++ b/src/libcore/ops.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Overloadable operators
+//! Overloadable operators.
 //!
 //! Implementing these traits allows you to get an effect similar to
 //! overloading operators.
diff --git a/src/libcore/option.rs b/src/libcore/option.rs
index e38cf9af010b9..56b84fd6a64dd 100644
--- a/src/libcore/option.rs
+++ b/src/libcore/option.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Optional values
+//! Optional values.
 //!
 //! Type `Option` represents an optional value: every `Option`
 //! is either `Some` and contains a value, or `None`, and
diff --git a/src/libcore/ptr.rs b/src/libcore/ptr.rs
index 3cf722668b24f..3cbeac450e218 100644
--- a/src/libcore/ptr.rs
+++ b/src/libcore/ptr.rs
@@ -10,7 +10,7 @@
 
 // FIXME: talk about offset, copy_memory, copy_nonoverlapping_memory
 
-//! Raw, unsafe pointers, `*const T`, and `*mut T`
+//! Raw, unsafe pointers, `*const T`, and `*mut T`.
 //!
 //! *[See also the pointer primitive types](../../std/primitive.pointer.html).*
 
diff --git a/src/libcore/result.rs b/src/libcore/result.rs
index f6703d16ad997..09f612c20ecdf 100644
--- a/src/libcore/result.rs
+++ b/src/libcore/result.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Error handling with the `Result` type
+//! Error handling with the `Result` type.
 //!
 //! `Result<T, E>` is the type used for returning and propagating
 //! errors. It is an enum with the variants, `Ok(T)`, representing
diff --git a/src/libstd/ascii.rs b/src/libstd/ascii.rs
index 587d1d422587b..5e15c0aefb709 100644
--- a/src/libstd/ascii.rs
+++ b/src/libstd/ascii.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations on ASCII strings and characters
+//! Operations on ASCII strings and characters.
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libstd/fs.rs b/src/libstd/fs.rs
index badbba21d55cc..53384fb9b154b 100644
--- a/src/libstd/fs.rs
+++ b/src/libstd/fs.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Filesystem manipulation operations
+//! Filesystem manipulation operations.
 //!
 //! This module contains basic methods to manipulate the contents of the local
 //! filesystem. All methods in this module represent cross-platform filesystem
diff --git a/src/libstd/os/mod.rs b/src/libstd/os/mod.rs
index e15c8d67a8a6c..72baa4abb2646 100644
--- a/src/libstd/os/mod.rs
+++ b/src/libstd/os/mod.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! OS-specific functionality
+//! OS-specific functionality.
 
 #![stable(feature = "os", since = "1.0.0")]
 #![allow(missing_docs, bad_style)]
diff --git a/src/libstd/prelude/mod.rs b/src/libstd/prelude/mod.rs
index ebd299efa78db..f4cd319f06454 100644
--- a/src/libstd/prelude/mod.rs
+++ b/src/libstd/prelude/mod.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! The Rust Prelude
+//! The Rust Prelude.
 //!
 //! Rust comes with a variety of things in its standard library. However, if
 //! you had to manually import every single thing that you used, it would be
diff --git a/src/libstd/sync/mod.rs b/src/libstd/sync/mod.rs
index 9c9aa20eff5c0..1a42b091831b3 100644
--- a/src/libstd/sync/mod.rs
+++ b/src/libstd/sync/mod.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Useful synchronization primitives
+//! Useful synchronization primitives.
 //!
 //! This module contains useful safe and unsafe synchronization primitives.
 //! Most of the primitives in this module do not provide any sort of locking
diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index 981ba1e36e9d5..6a923c8c094bf 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Native threads
+//! Native threads.
 //!
 //! ## The threading model
 //!