diff --git a/tools/warn/cpp_warn_patterns.py b/tools/warn/cpp_warn_patterns.py
index b738086..1e1aa43 100644
--- a/tools/warn/cpp_warn_patterns.py
+++ b/tools/warn/cpp_warn_patterns.py
@@ -297,6 +297,7 @@
            [r".*: warning: declaration 'class .+' does not declare anything"]),
     medium('Initialization order will be different',
            [r".*: warning: '.+' will be initialized after",
+            r".*: warning: initializer order does not match the declaration order",
             r".*: warning: field .+ will be initialized after .+Wreorder"]),
     skip('skip,   ....',
          [r".*: warning:   '.+'"]),
@@ -448,6 +449,7 @@
            [r".*: warning: 'operator new' must not return NULL unless it is declared 'throw\(\)' .+"]),
     medium('NULL used in arithmetic',
            [r".*: warning: NULL used in arithmetic",
+            r".*: warning: .* subtraction with a null pointer",
             r".*: warning: comparison between NULL and non-pointer"]),
     medium('Misspelled header guard',
            [r".*: warning: '.+' is used as a header guard .+ followed by .+ different macro"]),