diff --git a/ChangeLog.md b/ChangeLog.md
index f13ad22..4ee12f3 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,12 @@
 # Yatuli Changelog File #
 
+==================================================
+## Release v0.5 (May 29, 2017) (Public Release) ##
+
+### Improvements ###
+
+* Feature: now you has a lock var, when lock is true the code will refuse to update any values coming from the ADC; this is to avoid any form of FM modulation due to voltage variations due to high currents or RF when in use in real transceivers.
+
 ==================================================
 ## Release v0.4 (May 22, 2017) (First Public Release) ##
 
diff --git a/README.md b/README.md
index 9907fe2..40214f0 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ This is a kind of linear tuning and in the center with big steps on the edges:
 * You can dynamically reset the range and start value while running (useful in setups).
 * Negative values are supported in all the range (start, end & value)
 * Range is handled by 32 bit signed values, so it will work from -/+ 2.4G values.
+* Lock feature, you can lock in the lib when in TX (or wherever you case it).
 
 See the examples bundled with the lib for use cases.
 
diff --git a/library.properties b/library.properties
index 54bac17..45dabcc 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Yatuli (Yet Another Tune Library)
-version=0.4
+version=0.5
 author=Pavel Milanes <pavelmc@gmail.com>
 maintainer=Pavel Milanes <pavelmc@gmail.com>
 sentence=Tune your hardware with a linear potentiometer instead a rotary encoder: be cheap, have Fun!
diff --git a/src/yatuli.cpp b/src/yatuli.cpp
index 21f6192..19a4ac7 100644
--- a/src/yatuli.cpp
+++ b/src/yatuli.cpp
@@ -17,7 +17,7 @@
  * You can get the latest code in this Github repository:
  *
  * https://github.com/pavelmc/yatuli
- * 
+ *
  * 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
@@ -56,6 +56,9 @@ void Yatuli::init(uint8_t _pin, int32_t _start, int32_t _end, uint16_t _step, ui
     // some defaults
     base = start;
     value = start;
+
+    // defaults to unlock state
+    lock = false;
 }
 
 
@@ -86,11 +89,14 @@ void Yatuli::set(int32_t init_value) {
  * This is the one you NEED to run in every loop cycle to update value
  ****************************************************************************/
 void Yatuli::check(void) {
+    // lock flag
+    if (lock) return;
+
     // internal vars, statics as they are used repeatedly in this.
     static int16_t lastAdc = adc;
     static uint32_t newTime = millis();
     static boolean adcDir;
-    
+
     // update adc values
     _osadc();
 
@@ -109,18 +115,18 @@ void Yatuli::check(void) {
             // move
             value += (edgeStep * t);
             base += (edgeStep * t);
-            
+
             // reset pace timer
             newTime = millis() + PACE;
         }
     } else {
         // we are in the operative range
         // flutter fix, from bitx amunters raduino code, author Jerry KE7ER
-        
+
         // direction detectors... (re-using vars)
         up   = (adc > lastAdc) && (adcDir == 1 || (adc - lastAdc) > 5);
         down = (adc < lastAdc) && (adcDir == 0 || (lastAdc - adc) > 5);
-        
+
         // check it now
         if (up || down) {
             // flag about the direction of the movement
@@ -132,7 +138,7 @@ void Yatuli::check(void) {
 
             // force an update
             value  = base + (int32_t)(adc / 10) * step;
-            
+
             // force a consistent step interval
             value /= step;
             value *= step;
@@ -149,6 +155,9 @@ void Yatuli::check(void) {
  * convenient range of -5115 to +5115
  ****************************************************************************/
 void Yatuli::_osadc(void) {
+    // lock flag
+    if (lock) return;
+
     // internal var
     int32_t t = 0;
 
@@ -170,9 +179,12 @@ void Yatuli::_osadc(void) {
  * See OptionSelect example
  ****************************************************************************/
 int8_t Yatuli::dir(void) {
+    // lock flag
+    if (lock) return;
+
     // internal var
     static int16_t lastAdcDir = adc;
-    
+
     // calc the difference and scale to 20 tick per dial rotation
     int16_t result = (adc - lastAdcDir)/DIRTICKS;
 
diff --git a/src/yatuli.h b/src/yatuli.h
index a7622e2..993427b 100644
--- a/src/yatuli.h
+++ b/src/yatuli.h
@@ -17,7 +17,7 @@
  * You can get the latest code in this Github repository:
  *
  * https://github.com/pavelmc/yatuli
- *  
+ *
  * 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
@@ -66,13 +66,18 @@ class Yatuli {
 
         // Return a relative vector from the last position: -1/0/+1
         // it will emit about ~50 steps in one rotation
-        // WATCH OUT!: int8_t is char in arduino 
+        // WATCH OUT!: int8_t is char in arduino
         int8_t dir(void);
 
         // public value
         int16_t adc;            // oversampled ADC in the range -5115/+5115
         int32_t value;          // real value in the range
 
+        // lock feature, when lock is true, we refuse to update the value/dir
+        // as in a real TX high currents or RF can disturb the ADC and add FMing
+        // to the real freq.
+        bool lock;
+
     private:
         int32_t start;          // start of the range
         int32_t end;            // stop of the range
diff --git a/version b/version
index 1811f96..83b4ac5 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-v0.4
+v0.5