diff --git a/cs677/pa3/edge-detect.cc b/cs677/pa3/edge-detect.cc
index 6df3d65..fc70e3c 100644
--- a/cs677/pa3/edge-detect.cc
+++ b/cs677/pa3/edge-detect.cc
@@ -13,6 +13,9 @@ void squashAndPadData(unsigned char * raw_data, unsigned char * padded_data,
 void applyEdgeDetection(unsigned char * padded_data, unsigned char * edge_data,
                         int width, int height, int threshold);
 
+/**************************************************************************
+ * Print some basic usage information for the program                     *
+ *************************************************************************/
 void usage(const char * progName)
 {
     cout << "Usage: " << progName << " [options] <input-BMP-file>" << endl;
@@ -21,6 +24,9 @@ void usage(const char * progName)
     exit(42);
 }
 
+/**************************************************************************
+ * The main method is the entry point of our program                      *
+ *************************************************************************/
 int main(int argc, char * argv[])
 {
     int argi;
@@ -85,6 +91,10 @@ int main(int argc, char * argv[])
     delete[] edge_data;
 }
 
+/**************************************************************************
+ * Convert the 24-bpp BMP data pointed to by raw_data to a 8-bpp          *
+ * grayscale representation                                               *
+ *************************************************************************/
 void squashAndPadData(unsigned char * raw_data, unsigned char * padded_data,
                       int width, int height)
 {
@@ -104,6 +114,9 @@ void squashAndPadData(unsigned char * raw_data, unsigned char * padded_data,
         *padded_data++ = 0;
 }
 
+/**************************************************************************
+ * Apply the actual edge detection algorithm on the grayscale data        *
+ *************************************************************************/
 void applyEdgeDetection(unsigned char * padded_data, unsigned char * edge_data,
                         int width, int height, int threshold)
 {