diff --git a/README.md b/README.md
index 55f599235e..c4fdcf5c65 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ If you have access to a server that supports one of the sources below, I recomme
 
 ### 🐋 Docker
 
-[How to run Calckey with Docker](./docker-README.md).
+[How to run Calckey with Docker](./docs/docker.md).
 
 ## 🧑‍💻 Dependencies
 
@@ -136,12 +136,7 @@ psql postgres -c "create database calckey with encoding = 'UTF8';"
 
 ## 🚚 Migrating from Misskey to Calckey
 
-> ⚠️ Because of their changes, migrating from Foundkey is not supported.
-
-```sh
-cp ../misskey/.config/default.yml ./.config/default.yml # replace `../misskey/` with misskey path, add `docker.env` if you use Docker
-cp -r ../misskey/files .
-```
+For migrating from Misskey v13, Misskey v12, and Foundkey, read [this document](./docs/migrate.md).
 
 ## 🍀 NGINX
 
diff --git a/docker-README.md b/docs/docker.md
similarity index 100%
rename from docker-README.md
rename to docs/docker.md
diff --git a/docs/migrate.md b/docs/migrate.md
new file mode 100644
index 0000000000..990ccf35e7
--- /dev/null
+++ b/docs/migrate.md
@@ -0,0 +1,51 @@
+# 🚚 Migrating from Misskey to Calckey
+
+## Misskey v13 and above
+
+```sh
+git apply docs/mkv13.patch
+
+cd packages/backend
+
+LINE_NUM="$(npx typeorm migration:show -d ormconfig.js | grep -n activeEmailValidation1657346559800 | cut -d ':' -f 1)"
+NUM_MIGRATIONS="$(npx typeorm migration:show -d ormconfig.js | tail -n+"$LINE_NUM" | grep '\[X\]' | nl)"
+
+for i in $(seq 1 $NUM_MIGRAIONS); do
+    npx typeorm migration:revert -d ormconfig.js
+done
+
+git remote set-url origin https://codeberg.org/calckey/calckey.git
+git fetch
+git checkout main # or beta or develop
+git pull --ff
+# build using prefered method
+```
+
+## Misskey v12.119 and before
+
+```sh
+git remote set-url origin https://codeberg.org/calckey/calckey.git
+git fetch
+git checkout main # or beta or develop
+git pull --ff
+# build using prefered method
+```
+
+## Foundkey
+
+```sh
+cd packages/backend
+
+LINE_NUM="$(npx typeorm migration:show -d ormconfig.js | grep -n uniformThemecolor1652859567549 | cut -d ':' -f 1)"
+NUM_MIGRATIONS="$(npx typeorm migration:show -d ormconfig.js | tail -n+"$LINE_NUM" | grep '\[X\]' | nl)"
+
+for i in $(seq 1 $NUM_MIGRAIONS); do
+    npx typeorm migration:revert -d ormconfig.js
+done
+
+git remote set-url origin https://codeberg.org/calckey/calckey.git
+git fetch
+git checkout main # or beta or develop
+git pull --ff
+# build using prefered method
+```
diff --git a/docs/mkv13.patch b/docs/mkv13.patch
new file mode 100644
index 0000000000..e6106b16f2
--- /dev/null
+++ b/docs/mkv13.patch
@@ -0,0 +1,45 @@
+diff --git a/packages/backend/migration/1672704017999-remove-lastCommunicatedAt.js b/packages/backend/migration/1672704017999-remove-lastCommunicatedAt.js
+index 38a676985..c4ae690e0 100644
+--- a/packages/backend/migration/1672704017999-remove-lastCommunicatedAt.js
++++ b/packages/backend/migration/1672704017999-remove-lastCommunicatedAt.js
+@@ -6,6 +6,8 @@ export class removeLastCommunicatedAt1672704017999 {
+     }
+ 
+     async down(queryRunner) {
+-        await queryRunner.query(`ALTER TABLE "instance" ADD "lastCommunicatedAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
++        await queryRunner.query(`ALTER TABLE "instance" ADD "lastCommunicatedAt" TIMESTAMP WITH TIME ZONE`);
++        await queryRunner.query(`UPDATE "instance" SET "lastCommunicatedAt" = COALESCE("infoUpdatedAt", "caughtAt")`);
++        await queryRunner.query(`ALTER TABLE "instance" ALTER COLUMN "lastCommunicatedAt" SET NOT NULL`);
+     }
+ }
+diff --git a/packages/backend/migration/1673336077243-PollChoiceLength.js b/packages/backend/migration/1673336077243-PollChoiceLength.js
+index 810c626e0..5809528cb 100644
+--- a/packages/backend/migration/1673336077243-PollChoiceLength.js
++++ b/packages/backend/migration/1673336077243-PollChoiceLength.js
+@@ -6,6 +6,6 @@ export class PollChoiceLength1673336077243 {
+     }
+ 
+     async down(queryRunner) {
+-			await queryRunner.query(`ALTER TABLE "poll" ALTER COLUMN "choices" TYPE character varying(128) array`);
++			//await queryRunner.query(`ALTER TABLE "poll" ALTER COLUMN "choices" TYPE character varying(128) array`);
+     }
+ }
+diff --git a/packages/backend/migration/1674118260469-achievement.js b/packages/backend/migration/1674118260469-achievement.js
+index 131ab96f8..57a922f83 100644
+--- a/packages/backend/migration/1674118260469-achievement.js
++++ b/packages/backend/migration/1674118260469-achievement.js
+@@ -18,12 +18,13 @@ export class achievement1674118260469 {
+ 
+     async down(queryRunner) {
+         await queryRunner.query(`CREATE TYPE "public"."user_profile_mutingnotificationtypes_enum_old" AS ENUM('follow', 'mention', 'reply', 'renote', 'quote', 'reaction', 'pollVote', 'receiveFollowRequest', 'followRequestAccepted', 'groupInvited', 'app', 'pollEnded')`);
++        await queryRunner.query(`CREATE TYPE "public"."notification_type_enum_old" AS ENUM('follow', 'mention', 'reply', 'renote', 'quote', 'reaction', 'pollVote', 'pollEnded', 'receiveFollowRequest', 'followRequestAccepted', 'groupInvited', 'app')`);
+         await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" DROP DEFAULT`);
+         await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" TYPE "public"."user_profile_mutingnotificationtypes_enum_old"[] USING "mutingNotificationTypes"::"text"::"public"."user_profile_mutingnotificationtypes_enum_old"[]`);
+         await queryRunner.query(`ALTER TABLE "user_profile" ALTER COLUMN "mutingNotificationTypes" SET DEFAULT '{}'`);
+         await queryRunner.query(`DROP TYPE "public"."user_profile_mutingnotificationtypes_enum"`);
+         await queryRunner.query(`ALTER TYPE "public"."user_profile_mutingnotificationtypes_enum_old" RENAME TO "user_profile_mutingnotificationtypes_enum"`);
+-        await queryRunner.query(`CREATE TYPE "public"."notification_type_enum_old" AS ENUM('follow', 'mention', 'reply', 'renote', 'quote', 'reaction', 'pollVote', 'pollEnded', 'receiveFollowRequest', 'followRequestAccepted', 'groupInvited', 'app')`);
++        await queryRunner.query(`DELETE FROM "public"."notification" WHERE "type" = 'achievementEarned'`);
+         await queryRunner.query(`ALTER TABLE "notification" ALTER COLUMN "type" TYPE "public"."notification_type_enum_old" USING "type"::"text"::"public"."notification_type_enum_old"`);
+         await queryRunner.query(`DROP TYPE "public"."notification_type_enum"`);
+         await queryRunner.query(`ALTER TYPE "public"."notification_type_enum_old" RENAME TO "notification_type_enum"`);