diff --git a/src/libcollections/str.rs b/src/libcollections/str.rs
index a30ec452e3c15e3c7dfbfcca8c7c1c6e527d8e0f..5789cd8edfc09bafb60c794e60d8b1ac514e3488 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 769faedf46e8ebf4b57b6677add6c55a8ba00abb..b1f63ad71ca3740d1989c7bdfbe96fbb00edb583 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 a3b09e9db42d137a9aa3e96d02ab52fbd0424eba..6cc3b4e01b865dca4aefff08dbe5b74b75187d5b 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 377a8b6a05f5e348856352e67512e641c83a3362..fb8eda820f52c9df2d52e85514b79a6d27515306 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 c36ad592ad3b54500858bc8149a1a6e031cda2b3..2c648d1516bffc30d01aa7e382413544427ff61c 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 a6dbec6c39dab83a20263cf24a92ed6392a3daa1..5d6accc4438c94e09314de2a78cb8b0f806d05e3 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 e38cf9af010b9f9953fff8c59a0def8c0c36283e..56b84fd6a64ddd7289d8d21f1ea8d8c1548e04ba 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 3cf722668b24f8bffc1a31cd15055e65b98099e8..3cbeac450e2182276869981880026bc66839cd0c 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 f6703d16ad997e988e347bb45720356985b5c572..09f612c20ecdfe04a1524b8cf1624803374b72e9 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 98685cae870725c0e7dbf91e66f369d75a4d8389..031a9b8bec27459225f2300c92504e224217ca06 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 badbba21d55cc9ddfbf7c55f266a7be4760550ea..53384fb9b154b385bb728b61d1c597e107b60d88 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 e15c8d67a8a6c7638fed251a420f649b3d3a5023..72baa4abb26460c3c8c44d99d640b92c37b8194a 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 ebd299efa78db9ca89206ec41af9885f921b861a..f4cd319f06454a128b5ec701f3de83f56f3d1a36 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 9c9aa20eff5c0e292b95a6a368e8c63f9bceaaf1..1a42b091831b3a4244e8d54aab3a0851cbd5003b 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 981ba1e36e9d5c531b7811365b6039443b0fb921..6a923c8c094bfc80fa8792619c8c320a0b11ca69 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
 //!