diff --git a/src/sesim/OHLCData.java b/src/sesim/OHLCData.java
index 6aecd7e..b28f1a4 100644
--- a/src/sesim/OHLCData.java
+++ b/src/sesim/OHLCData.java
@@ -104,6 +104,12 @@ public class OHLCData {
         return minmax;
     }
 
+    /**
+     * Get minimum an maximum from volume
+     * @param first
+     * @param last
+     * @return MinMax found
+     */
     public MinMax getVolMinMax(int first, int last) {
 
         if (first >= data.size()) {