diff --git a/ctx_aut.cc b/ctx_aut.cc
index b51d2de..38030dd 100644
--- a/ctx_aut.cc
+++ b/ctx_aut.cc
@@ -40,9 +40,23 @@ void CtxAut::addState(std::string name)
 
         states_ids.push_back(name);
         states_names[name] = new_state_id;
+		
+		if (!init_state_defined)
+		{
+			setInitState(name);
+		}
     }
 }
 
+void CtxAut::setInitState(std::string name)
+{
+	VERB_L2("Setting initial CA state: " << name);
+	State state_id = getStateID(name);
+	VERB_L2("Got initial CA state ID: index=" << state_id);
+	init_state_id = state_id;
+	init_state_defined = true;
+}
+
 void CtxAut::printAutomaton(void)
 {
 	showStates();
@@ -52,6 +66,7 @@ void CtxAut::printAutomaton(void)
 void CtxAut::showStates(void)
 {
 	cout << "# Context Automaton States:" << endl;
+	cout << " = Init state: " << getStateName(init_state_id) << endl;
 	for (const auto &s : states_ids)
 		cout << " * " << s << endl;
 }
diff --git a/ctx_aut.hh b/ctx_aut.hh
index fe08848..7c81aa1 100644
--- a/ctx_aut.hh
+++ b/ctx_aut.hh
@@ -31,6 +31,7 @@ class CtxAut
 		CtxAut(Options *opts, RctSys *parent_rctsys);
 		bool hasState(std::string name);
 		void addState(std::string stateName);
+		void setInitState(std::string stateName);
 		State getStateID(std::string name);
 		std::string getStateName(State state_id);
 		void printAutomaton(void);
@@ -45,6 +46,8 @@ class CtxAut
 	    Options *opts;
 		StatesById states_ids;
 		StatesByName states_names;
+		State init_state_id;
+		bool init_state_defined;
 		Entities tmpEntities;
 		Transitions transitions;
 };
diff --git a/rs.cc b/rs.cc
index 4ce6a67..7ccacf3 100644
--- a/rs.cc
+++ b/rs.cc
@@ -190,15 +190,21 @@ void RctSys::ctxAutAddState(std::string stateName)
 	ctx_aut->addState(stateName);
 }
 
+void RctSys::ctxAutSetInitState(std::string stateName)
+{
+	assert(ctx_aut != nullptr);
+	ctx_aut->setInitState(stateName);
+}
+
 void RctSys::ctxAutAddTransition(std::string srcStateName, std::string dstStateName)
 {
 	assert(ctx_aut != nullptr);
 	ctx_aut->addTransition(srcStateName, dstStateName);
 }
 
-void RctSys::ctxAutPushNamedContextEntity(std::string entity_name)
+void RctSys::ctxAutPushNamedContextEntity(std::string entityName)
 {
 	assert(ctx_aut != nullptr);
-	Entity entity_id = getEntityID(entity_name);
+	Entity entity_id = getEntityID(entityName);
 	ctx_aut->pushContextEntity(entity_id);
 }
diff --git a/rs.hh b/rs.hh
index a253a59..3470b70 100644
--- a/rs.hh
+++ b/rs.hh
@@ -71,6 +71,7 @@ class RctSys
 
 		void ctxAutEnable(void);		
 		void ctxAutAddState(std::string stateName);
+		void ctxAutSetInitState(std::string stateName);
 		void ctxAutAddTransition(std::string srcStateName, std::string dstStateName);
 		void ctxAutPushNamedContextEntity(std::string entity_name);
 		
diff --git a/rsin_parser.ll b/rsin_parser.ll
index 8f72e39..ba2cbf8 100644
--- a/rsin_parser.ll
+++ b/rsin_parser.ll
@@ -47,6 +47,7 @@ blank [ \t]
 "context-automaton"		return token::CONTEXTAUTOMATON;
 "transitions"			return token::TRANSITIONS;
 "states"				return token::STATES;
+"init-state"			return token::INITSTATE;
 "rsctl-property"        return token::RSCTLFORM;
 "{"                     return token::LCB;
 "}"                     return token::RCB;
diff --git a/rsin_parser.yy b/rsin_parser.yy
index 523dfcc..1038cec 100644
--- a/rsin_parser.yy
+++ b/rsin_parser.yy
@@ -46,7 +46,7 @@ class rsin_driver;
 
 %token OPTIONS USE_CTX_AUT USE_CONCENTRATIONS
 %token REACTIONS INITIALCONTEXTS CONTEXTENTITIES RSCTLFORM
-%token CONTEXTAUTOMATON STATES TRANSITIONS
+%token CONTEXTAUTOMATON STATES INITSTATE TRANSITIONS
 %token LCB RCB LRB RRB LSB RSB LAB RAB COL SEMICOL COMMA RARR
 %token AND OR XOR IMPLIES NOT
 %token EX EU EF EG AX AU AF AG E A X U F G EMPTY
@@ -191,6 +191,7 @@ actentity: IDENTIFIER {
 
 ctxaut:
 	| STATES LCB autstates RCB ctxaut
+	| INITSTATE LCB autinitstate RCB ctxaut
 	| TRANSITIONS LCB auttransitions RCB ctxaut
 	;
 
@@ -204,6 +205,12 @@ autstates:
 	autstate
 	| autstate COMMA autstates
 	;
+
+autinitstate: IDENTIFIER {
+		driver.getReactionSystem()->ctxAutSetInitState(*$1);
+		free($1);
+	}
+	;
 	
 auttransitions:
 	| auttrans