added comments and disclaimer to the readme

README.md

@@ -1,2 +1,4 @@
 # Lina
 Lina (***Lin**ear **A**lgebra*) is a C library that implements common linear algebra operations.
+
+Note that this is still a work in progress.

src/lina.c

@@ -655,11 +655,15 @@ void lina_conv(double *A, double *B, double *C,
     int Ch = Ah - Bh + 1;
     assert(Cw > 0 && Ch > 0);
 
+    // Iterate over each pixel of the result matrix..
     for(int j = 0; j < Ah - Bh + 1; j += 1)
         for(int i = 0; i < Aw - Bw + 1; i += 1)
             {
-                C[j * Cw + i] = 0;
+                // ..and calculate it's value as
+                // the scalar product between the
+                // mask B and a portion of A.
 
+                C[j * Cw + i] = 0;
                 for(int v = 0; v < Bh; v += 1)
                     for(int u = 0; u < Bw; u += 1)
                         C[j * Cw + i] += A[(i - Bw/2 + u) * Aw + (i - Bh/2 + v)] * B[u * Bw + v];