Page 514 - Enders_Game_Full_Book

"The covenant," said Human.
Only then did they realize that the printout was upside down, on the blank side of the paper. And there, in the light of a nightstick, they saw faint hand-printed letters. They were large and awkwardly formed. Ouanda was in awe. "We never taught them to make ink," she said. "We never taught them to write."
"Calendar learned to make the letters," said Human. "Writing with sticks in the dirt. And Worm made the ink from cabra dung and dried macios. This is how you make treaties, isn't it?"
"Yes," said Ender.
"If we didn't write it on paper, then we would remember it differently." "That's right," said Ender. "You did well to write it down."
"We made some changes. The wives wanted some changes, and I thought you would accept them." Human pointed them out. "You humans can make this covenant with other piggies, but you can't make a different covenant. You can't teach any other piggies things you haven't taught us. Can you accept that?"
"Of course," said Ender.
"That was the easy one. Now, what if we disagree about what the rules are? What if we disagree about where your prairie land ends and ours begins? So Shouter said, Let the hive queen judge between humans and Little Ones. Let the humans judge between the Little Ones and the hive queen. And let Little Ones judge between the hive queen and the humans."
Ender wondered how easy that would be. He remembered, as no other living human did, how terrifying the buggers were three thousand years ago. Their insectlike bodies were the nightmares of humanity's childhood. How easily would the people of Milagre accept their judgment?
So it's hard. It's no harder than what we've asked the piggies to do. "Yes," said Ender. "We can accept that, too. It's a good plan."
"And another change," said Human. He looked up at Ender and grinned. It looked ghastly, since piggy faces weren't designed for that human expression. "This is why it took so long. All these changes."
Ender smiled back.
"If a tribe of piggies won't sign the covenant with humans, and if that tribe attacks one of the tribes that has signed the covenant, then we can go to war against them."