Add comments about the match condition of the peak and reflex

src/geomtools/sfx/crystfelio.py

@@ -43,6 +43,11 @@ def _buffer_to_line(f, marker):
 
 
 def match_reflexes_to_peaks(reflexes, peaks, lattices, panels, rmax):
+    
+    # 1. distance
+    # 2. one reflex to one peak
+    # 3. one peak to one reflex in the same crystal
+    #    but to can also match refelex in other crystals    
     r2max = rmax * rmax
 
     re = reflexes[['fs', 'ss', 'panel', 'frame', 'cryst']].copy()