diff --git a/module.rb b/module.rb
index 19a6d5e..0fb24e5 100755
--- a/module.rb
+++ b/module.rb
@@ -409,6 +409,11 @@ def sumaPunktow(a,b,p,x1,y1,x2,y2)
     y3 = (lambda * (x1 - x3) - y1) % p
     return x3,y3
   end
+  # P + -Q = 0 DZIALA
+  if (x1 == x2) && (y1 == y2%p)
+    #puts "0 - el.neutralny"
+    return "e","e"
+  end
 end
 
 #### MODULE 3 ####