diff --git a/envi/bsq.h b/envi/bsq.h
index d8d7b13..4bc6004 100644
--- a/envi/bsq.h
+++ b/envi/bsq.h
@@ -52,7 +52,6 @@ public:
 
 		file.read((char *)p, sizeof(T) * R[0] * R[1]);
 
-//		getSlice(p, 2, page);
 		return true;
 	}
 
@@ -64,10 +63,10 @@ public:
 			return band_index(p, (unsigned int)wavelength);
 
 		unsigned int XY = R[0] * R[1];	//calculate the number of pixels in a band
-		unsigned page=0;                      //bands around the wavelength
+		unsigned page = 0;                
 
 
-		//get the bands numbers around the wavelength
+		//get the two neighboring bands (above and below 'wavelength')
 
 		//if wavelength is smaller than the first one in header file
 		if ( w[page] > wavelength ){
@@ -78,14 +77,16 @@ public:
 		while( w[page] < wavelength )
 		{
 			page++;
-			//if wavelength is larger than the last wavelength in header file
+			//if wavelength is larger than the last wavelength in the header file
+			//	(the wavelength is out of bounds)
 			if (page == R[2]) {
-				getSlice(p, 2, R[2]-1);
+				band_index(p, R[2]-1);		//return the last band
 				return true;
 			}
 		}
-		if ( wavelength < w[page] )
-		{
+		//when the page counter points to the first band above 'wavelength'
+		if ( wavelength < w[page] ){
+			//do the interpolation
 			T * p1;
 			T * p2;
 			p1=(T*)malloc( XY * sizeof(T));                     //memory allocation
@@ -99,9 +100,9 @@ public:
 			free(p1);
 			free(p2);
 		}
-		else                           //if the wavelength is equal to a wavelength in header file
-		{
-			band_index(p, page);
+		//if the wavelength is equal to a wavelength in header file
+		else{
+			band_index(p, page);		//return the band
 		}
 
 		return true;
--
libgit2 0.21.4