diff --git a/btparser/ast.h b/btparser/ast.h
index 6d83a8a..b6512fe 100644
--- a/btparser/ast.h
+++ b/btparser/ast.h
@@ -55,7 +55,7 @@ namespace AST
     {
     };
 
-    class BuiltinVar : public Decl //built-in variable declaration (int x)
+    class BuiltinVar : public Decl //built-in variable declaration (int x;)
     {
         Type mType;
         string mName;
diff --git a/btparser/keywords.h b/btparser/keywords.h
index cdc948c..7a56efb 100644
--- a/btparser/keywords.h
+++ b/btparser/keywords.h
@@ -22,7 +22,9 @@ DEF_KEYWORD(struct)
 DEF_KEYWORD(typedef)
 DEF_KEYWORD(sizeof)
 DEF_KEYWORD(void)
+DEF_KEYWORD(union)
 
+DEF_KEYWORD(signed)
 DEF_KEYWORD(unsigned)
 DEF_KEYWORD(local)
 
@@ -33,6 +35,8 @@ DEF_KEYWORD(false)
 DEF_KEYWORD(char)
 DEF_KEYWORD(uchar)
 DEF_KEYWORD(wchar_t)
+DEF_KEYWORD(char16_t)
+DEF_KEYWORD(char32_t)
 
 DEF_KEYWORD(byte)
 DEF_KEYWORD(ubyte)
@@ -59,6 +63,7 @@ DEF_KEYWORD(WORD)
 DEF_KEYWORD(DWORD)
 DEF_KEYWORD(QWORD)
 
+DEF_KEYWORD(float)
 DEF_KEYWORD(double)
 DEF_KEYWORD(string)
 DEF_KEYWORD(time_t)
@@ -72,4 +77,7 @@ DEF_KEYWORD(UQUAD)
 DEF_KEYWORD(LONGLONG)
 DEF_KEYWORD(ULONG_PTR)
 DEF_KEYWORD(VQUAD)
-DEF_KEYWORD(UINT32)
\ No newline at end of file
+DEF_KEYWORD(UINT32)
+
+DEF_KEYWORD(nullptr)
+DEF_KEYWORD(NULL)
\ No newline at end of file
diff --git a/btparser/operators.h b/btparser/operators.h
index c215f0a..eea8bfc 100644
--- a/btparser/operators.h
+++ b/btparser/operators.h
@@ -57,6 +57,4 @@ DEF_OP_SINGLE(op_or, '|')
 
 DEF_OP_SINGLE(lop_le, '<')
 DEF_OP_SINGLE(lop_gr, '>')
-DEF_OP_SINGLE(lop_not, '!')
-
-
+DEF_OP_SINGLE(lop_not, '!')
\ No newline at end of file