Index: ObjFW.xcodeproj/project.pbxproj
==================================================================
--- ObjFW.xcodeproj/project.pbxproj
+++ ObjFW.xcodeproj/project.pbxproj
@@ -2128,13 +2128,16 @@
 				);
 				WARNING_CFLAGS = (
 					"-Wall",
 					"-Werror",
 					"-Wshorten-64-to-32",
+					"-Wsemicolon-before-method-body",
+					"-Wobjc-property-synthesis",
 					"-Wwrite-strings",
-					"-Wcast-align",
 					"-Wpointer-arith",
+					"-Wcast-align",
+					"-Wdocumentation",
 				);
 			};
 			name = Debug;
 		};
 		1DEB919508733D9F0010E9CD /* Release */ = {
@@ -2152,13 +2155,16 @@
 				);
 				WARNING_CFLAGS = (
 					"-Wall",
 					"-Werror",
 					"-Wshorten-64-to-32",
+					"-Wsemicolon-before-method-body",
+					"-Wobjc-property-synthesis",
 					"-Wwrite-strings",
-					"-Wcast-align",
 					"-Wpointer-arith",
+					"-Wcast-align",
+					"-Wdocumentation",
 				);
 			};
 			name = Release;
 		};
 		4B187E20163EA29F0049A832 /* Debug */ = {