diff --git a/kin/grammar/PBXProj.g4 b/kin/grammar/PBXProj.g4
index 91112de..39c560c 100644
--- a/kin/grammar/PBXProj.g4
+++ b/kin/grammar/PBXProj.g4
@@ -34,6 +34,7 @@ objects
     : OBJECTS '=' '{'
         pbx_aggregate_target_section?
         pbx_build_file_section?
+        pbx_build_style_section?
         pbx_container_item_proxy_section?
         pbx_copy_files_build_phase_section?
         pbx_file_reference_section
@@ -71,6 +72,10 @@ pbx_build_file_section
     : (pbx_build_file)+
     ;
 
+pbx_build_style_section
+    : (pbx_build_style)+
+    ;
+
 pbx_container_item_proxy_section
     : (pbx_container_item_proxy)+
     ;
@@ -176,6 +181,14 @@ pbx_build_file
       '}' ';'
     ;
 
+pbx_build_style
+    : REFERENCE '=' '{'
+        isa_pbx_build_style
+        build_settings
+        name
+      '}' ';'
+    ;
+
 pbx_container_item_proxy
     : REFERENCE '=' '{'
         isa_pbx_container_item_proxy
@@ -289,7 +302,8 @@ pbx_project
         attributes?
         build_configuration_list
         build_settings?
-        compatibility_version
+        compatibility_version?
+        build_styles?
         development_region?
         has_scanned_for_encodings
         known_regions?
@@ -298,7 +312,7 @@ pbx_project
         product_ref_group?
         project_dir_path
         project_references?
-        project_root
+        project_root?
         targets
       '}' ';'
     ;
@@ -428,6 +442,10 @@ isa_pbx_build_file
     : ISA '=' PBX_BUILD_FILE ';'
     ;
 
+isa_pbx_build_style
+    : ISA '=' PBX_BUILD_STYLE ';'
+    ;
+
 isa_pbx_container_item_proxy
     : ISA '=' PBX_CONTAINER_ITEM_PROXY ';'
     ;
@@ -876,6 +894,10 @@ build_settings
       '}' ';'
     ;
 
+build_styles
+    : BUILD_STYLES '=' reference_list ';'
+    ;
+
 dst_path
     : DST_PATH '=' any_string ';'
     ;
@@ -956,6 +978,7 @@ any_token
     | ROOT_OBJECT
     | PBX_AGGREGATE_TARGET
     | PBX_BUILD_FILE
+    | PBX_BUILD_STYLE
     | PBX_CONTAINER_ITEM_PROXY
     | PBX_COPY_FILES_BUILD_PHASE
     | PBX_FILE_REFERENCE
@@ -1085,6 +1108,7 @@ SLASH: '/';
 UNDERSCORE: '_';
 PBX_AGGREGATE_TARGET: 'PBXAggregateTarget';
 PBX_BUILD_FILE: 'PBXBuildFile';
+PBX_BUILD_STYLE: 'PBXBuildStyle';
 PBX_CONTAINER_ITEM_PROXY: 'PBXContainerItemProxy';
 PBX_COPY_FILES_BUILD_PHASE: 'PBXCopyFilesBuildPhase';
 PBX_FILE_REFERENCE: 'PBXFileReference';
@@ -1187,6 +1211,7 @@ FILE_TYPE : 'fileType';
 REMOTE_REF : 'remoteRef';
 BASE_CONFIGURATION_REFERENCE : 'baseConfigurationReference';
 BUILD_SETTINGS : 'buildSettings';
+BUILD_STYLES : 'buildStyles';
 DST_PATH : 'dstPath';
 DST_SUBFOLDER_SPEC : 'dstSubfolderSpec';
 PRODUCT_GROUP : 'ProductGroup';