diff --git a/lib/xcodeproj/project/object/build_configuration.rb b/lib/xcodeproj/project/object/build_configuration.rb
index 8e8b94fc..624e8c8b 100644
--- a/lib/xcodeproj/project/object/build_configuration.rb
+++ b/lib/xcodeproj/project/object/build_configuration.rb
@@ -27,16 +27,16 @@ class XCBuildConfiguration < AbstractObject
         #
         has_one :base_configuration_reference, PBXFileReference
 
-        # @return [PBXFileSystemSynchronizedRootGroup] an optional reference to a group 
+        # @return [PBXFileSystemSynchronizedRootGroup] an optional reference to a group
         #         synchronized with the file system that contains a configuration file (`.xcconfig`).
-        # 
+        #
         # @note   the configuration file relative path must be provided in `base_configuration_reference_relative_path`
         #
         has_one :base_configuration_reference_anchor, PBXFileSystemSynchronizedRootGroup
 
         # @return [String] the relative path of a configuration file (`.xcconfig`)
         #         inside a group synchronized with the file system.
-        # 
+        #
         # @note   the configuration file group must be provided in `base_configuration_reference_anchor`
         #
         attribute :base_configuration_reference_relative_path, String
diff --git a/lib/xcodeproj/project/object/file_system_synchronized_exception_set.rb b/lib/xcodeproj/project/object/file_system_synchronized_exception_set.rb
index 702569c7..b23dca01 100644
--- a/lib/xcodeproj/project/object/file_system_synchronized_exception_set.rb
+++ b/lib/xcodeproj/project/object/file_system_synchronized_exception_set.rb
@@ -4,10 +4,8 @@
 module Xcodeproj
   class Project
     module Object
-      
       # This class represents a file system synchronized build file exception set.
       class PBXFileSystemSynchronizedBuildFileExceptionSet < AbstractObject
-
         # @return [AbstractTarget] The target to which this exception set applies.
         #
         has_one :target, AbstractTarget
@@ -31,7 +29,7 @@ class PBXFileSystemSynchronizedBuildFileExceptionSet < AbstractObject
         # @return [Hash] The files with specific attributes.
         #
         attribute :attributes_by_relative_path, Hash
-        
+
         # @return [Hash] The files with a platform filter.
         #
         attribute :platform_filters_by_relative_path, Hash
@@ -43,7 +41,6 @@ def display_name
 
       # This class represents a file system synchronized group build phase membership exception set.
       class PBXFileSystemSynchronizedGroupBuildPhaseMembershipExceptionSet < AbstractObject
-
         # @return [PBXSourcesBuildPhase] The build phase to which this exception set applies.
         #
         has_one :build_phase, PBXSourcesBuildPhase
@@ -60,7 +57,6 @@ def display_name
           "Exceptions for \"#{GroupableHelper.parent(self).display_name}\" folder in \"#{build_phase.name}\" build phase"
         end
       end
-      
     end
   end
 end
diff --git a/lib/xcodeproj/project/object/file_system_synchronized_root_group.rb b/lib/xcodeproj/project/object/file_system_synchronized_root_group.rb
index 891908a6..4a26bc6a 100644
--- a/lib/xcodeproj/project/object/file_system_synchronized_root_group.rb
+++ b/lib/xcodeproj/project/object/file_system_synchronized_root_group.rb
@@ -5,7 +5,6 @@ class Project
     module Object
       # This class represents a file system synchronized root group.
       class PBXFileSystemSynchronizedRootGroup < AbstractObject
-        
         # @return [String] the directory to which the path is relative.
         #
         # @note   The accepted values are:
@@ -52,7 +51,7 @@ class PBXFileSystemSynchronizedRootGroup < AbstractObject
         #
         attribute :wraps_lines, String
 
-        # @return [Array<PBXFileSystemSynchronizedBuildFileExceptionSet, PBXFileSystemSynchronizedGroupBuildPhaseMembershipExceptionSet>] 
+        # @return [Array<PBXFileSystemSynchronizedBuildFileExceptionSet, PBXFileSystemSynchronizedGroupBuildPhaseMembershipExceptionSet>]
         #         The list of exceptions applying to this group.
         #
         has_many :exceptions, [PBXFileSystemSynchronizedBuildFileExceptionSet, PBXFileSystemSynchronizedGroupBuildPhaseMembershipExceptionSet]