git_stack.h

diff --git a/stack.h b/stack.h
index 879944b..30d90ef 100644
--- a/stack.h
+++ b/stack.h
@@ -1,3 +1,21 @@
+/*
+ *    "Stack" is very simple implementation of stack data structure
+ *    Copyright (C) 2015  Robin Obůrka
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #ifndef STACK_H
 #define STACK_H
 #include <stdbool.h>
@@ -13,5 +31,6 @@ void stack_destroy(struct stack_ctx *ctx);
 void stack_push(struct stack_ctx *ctx, int num);
 int stack_pop(struct stack_ctx *ctx);
 bool stack_is_empty(struct stack_ctx *ctx);
+bool stack_has_items(struct stack_ctx *ctx);

 #endif //STACK_H