diff --git a/tools/diff.sh b/tools/diff.sh
index 2f54b3a..3a56da7 100644
--- a/tools/diff.sh
+++ b/tools/diff.sh
@@ -57,6 +57,16 @@ process_files() {
                 sed -i 's/other = FRA/other = YUW/g' "$file"
                 sed -i 's/other = JAP/other = CHY/g' "$file"
                 sed -i 's/other = ITA/other = SAD/g' "$file"
+                # is_ally_with = xxx
+                sed -i 's/is_ally_with = ENG/is_ally_with = HUJ/g' "$file"
+                sed -i 's/is_ally_with = USA/is_ally_with = BYG/g' "$file"
+                sed -i 's/is_ally_with = CHI/is_ally_with = DOH/g' "$file"
+                sed -i 's/is_ally_with = PRC/is_ally_with = DOH/g' "$file"
+                sed -i 's/is_ally_with = SOV/is_ally_with = BFL/g' "$file"
+                sed -i 's/is_ally_with = GER/is_ally_with = TIX/g' "$file"
+                sed -i 's/is_ally_with = FRA/is_ally_with = YUW/g' "$file"
+                sed -i 's/is_ally_with = JAP/is_ally_with = CHY/g' "$file"
+                sed -i 's/is_ally_with = ITA/is_ally_with = SAD/g' "$file"
                 # Others
                 sed -i 's/ ENG / HUJ /g' "$file"
                 sed -i 's/ USA / BYG /g' "$file"