diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d76401..96b2208 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -137,7 +137,7 @@ Version 3.1.0 (2017-07-28)
 * [PHP 7.2] Added support for trailing comma in group use statements.
 * [PHP 7.2] Added support for `object` type. This means `object` types will now be represented as a
   builtin type (a simple `"object"` string), rather than a class `Name`.
-  
+
 ### Fixed
 
 * Floating-point numbers are now printed correctly if the LC_NUMERIC locale uses a comma as decimal
@@ -257,7 +257,7 @@ This release primarily improves our support for error recovery.
   `NameResolver::__construct()`.
 * The `NameResolver` now adds a `namespacedName` attribute on name nodes that cannot be statically
   resolved (unqualified unaliased function or constant names in namespaces).
-  
+
 ### Fixed
 
 * Fixed attribute assignment for `GroupUse` prefix and variables in interpolated strings.
diff --git a/UPGRADE-4.0.md b/UPGRADE-4.0.md
index 430102b..afa9685 100644
--- a/UPGRADE-4.0.md
+++ b/UPGRADE-4.0.md
@@ -52,7 +52,7 @@ Because HHVM does not support PHP 7, HHVM is no longer supported.
 * The `alias` subnode of `UseUse` is now `null` if no explicit alias is given. As such,
   `use Foo\Bar` and `use Foo\Bar as Bar` are now represented differently. The `getAlias()` method
   can be used to get the effective alias, even if it is not explicitly given.
-  
+
 ### Miscellaneous
 
 * The indentation handling in the pretty printer has been changed (this is only relevant if you
diff --git a/doc/README.md b/doc/README.md
index aac9670..510b131 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -9,10 +9,10 @@ Guide
   3. [Other node tree representations](3_Other_node_tree_representations.markdown)
   4. [Code generation](4_Code_generation.markdown)
   5. [Frequently asked questions](5_FAQ.markdown)
- 
+
 Component documentation
 -----------------------
- 
+
   * [Name resolution](component/Name_resolution.markdown)
     * Name resolver options
     * Name resolution context