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diff --git a/spaghetti-monster/fsm-states.h b/spaghetti-monster/fsm-states.h
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+++ b/spaghetti-monster/fsm-states.h
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+/*
+ * fsm-states.h: State-handling functions for SpaghettiMonster.
+ *
+ * Copyright (C) 2017 Selene ToyKeeper
+ *
+ * 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 FSM_STATES_H
+#define FSM_STATES_H
+
+#include "fsm-adc.h"
+
+// typedefs
+typedef uint8_t State(EventPtr event, uint16_t arg);
+typedef State * StatePtr;
+
+// top of the stack
+volatile StatePtr current_state;
+
+// stack for states, to allow shared utility states like "input a number"
+// and such, which return to the previous state after finishing
+#define STATE_STACK_SIZE 8
+StatePtr state_stack[STATE_STACK_SIZE];
+uint8_t state_stack_len = 0;
+
+void _set_state(StatePtr new_state, uint16_t arg);
+int8_t push_state(StatePtr new_state, uint16_t arg);
+StatePtr pop_state();
+uint8_t set_state(StatePtr new_state, uint16_t arg);
+uint8_t default_state(EventPtr event, uint16_t arg);
+
+#endif