add back comment

eip7594/src/recovery.rs

@@ -129,6 +129,10 @@ mod validation {
 
         // Check that we don't have too many cells
         // ie more than we initially generated from the blob
+        //
+        // Note: Since we check that there are no duplicates and that all cell_indices
+        // are between 0 and CELLS_PER_EXT_BLOB. This check should never fail.
+        // It is kept here to be compliant with the specs.
         if cell_indices.len() > CELLS_PER_EXT_BLOB {
             return Err(RecoveryError::TooManyCellsReceived {
                 num_cells_received: cell_indices.len(),