diff --git a/CMakeLists.txt b/CMakeLists.txt
index 95c9f964..c7bcfe58 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,8 +3,8 @@ cmake_policy(SET CMP0017 NEW) # need include() with .cmake
 project(pip)
 set(pip_MAJOR    2)
 set(pip_MINOR    14)
-set(pip_REVISION 0)
-set(pip_SUFFIX   beta)
+set(pip_REVISION 1)
+set(pip_SUFFIX   )
 set(pip_COMPANY  SHS)
 set(pip_DOMAIN   org.SHS)
 
diff --git a/libs/main/math/pievaluator.cpp b/libs/main/math/pievaluator.cpp
index 06e3fbf2..87414136 100644
--- a/libs/main/math/pievaluator.cpp
+++ b/libs/main/math/pievaluator.cpp
@@ -330,8 +330,10 @@ void PIEvaluator::makeOutput(PIString & string) {
 void PIEvaluator::findUnknownVariables() {
 	PIString cvar;
 	unknownVars.clear();
+	usedVars.clear();
 	for (int i = 0; i < currentString.length(); i++) {
-		if (elements[i].var_num == -666) cvar += currentString[i];
+		if (elements[i].var_num >= 0) usedVars << content.variable(elements[i].var_num).name;
+		else if (elements[i].var_num == -666) cvar += currentString[i];
 		else {
 			if (cvar.length() == 0) continue;
 			unknownVars << cvar;
@@ -340,6 +342,7 @@ void PIEvaluator::findUnknownVariables() {
 	}
 	if (cvar.length() > 0) unknownVars << cvar;
 	unknownVars.removeDuplicates();
+	usedVars.removeDuplicates();
 }
 
 
@@ -1196,7 +1199,7 @@ complexd PIEvaluator::evaluate() {
 
 PIByteArray PIEvaluator::save() const {
 	PIByteArray ret;
-	ret << content << currentVariables << unknownVars << instructions << currentString << lastError << out << correct;
+	ret << content << currentVariables << unknownVars << instructions << currentString << lastError << out << correct << usedVars;
 	return ret;
 }
 
@@ -1204,5 +1207,6 @@ PIByteArray PIEvaluator::save() const {
 void PIEvaluator::load(PIByteArray ba) {
 	if (ba.size() <= 4) return;
 	ba >> content >> currentVariables >> unknownVars >> instructions >> currentString >> lastError >> out >> correct;
+	if (ba.size() >= 4) ba >> usedVars;
 	variables = currentVariables;
 }
diff --git a/libs/main/math/pievaluator.h b/libs/main/math/pievaluator.h
index 94ff6250..5433fb57 100644
--- a/libs/main/math/pievaluator.h
+++ b/libs/main/math/pievaluator.h
@@ -176,6 +176,9 @@ public:
 	//! Returns all unknown variables founded in last expression passed to \a check() function
 	const PIStringList & unknownVariables() const {return unknownVars;}
 
+	//! Returns all used variables founded in last expression passed to \a check() function
+	const PIStringList & usedVariables() const {return usedVars;}
+
 	//! Returns processed last expression passed to \a check() function
 	const PIString & expression() const {return currentString;}
 
@@ -220,7 +223,7 @@ private:
 	PIDeque<PIEvaluatorTypes::Element> elements;
 	PIVector<PIEvaluatorTypes::Variable> currentVariables, variables, tmpvars, * kvars;
 	PIVector<PIEvaluatorTypes::Instruction> instructions;
-	PIStringList unknownVars;
+	PIStringList unknownVars, usedVars;
 	PIString currentString, lastError;
 	complexd out;
 	bool correct;