6 files changed, 13 insertions, 7 deletions
diff --git a/docs/installation/alpine_linux_en.md b/docs/installation/alpine_linux_en.md
index a5683f18c..f393e4978 100644
--- a/docs/installation/alpine_linux_en.md
+++ b/docs/installation/alpine_linux_en.md
@@ -13,6 +13,7 @@ It assumes that you have administrative rights, either as root or a user with [s
 * `erlang-parsetools`
 * `erlang-xmerl`
 * `git`
+* `file-dev`
 * Development Tools
 * `cmake`
 
@@ -40,7 +41,7 @@ sudo apk upgrade
 * Install some tools, which are needed later:
 
 ```shell
-sudo apk add git build-base cmake
+sudo apk add git build-base cmake file-dev
 ```
 
 ### Install Elixir and Erlang
diff --git a/docs/installation/arch_linux_en.md b/docs/installation/arch_linux_en.md
index 7fb69dd60..99eb011ad 100644
--- a/docs/installation/arch_linux_en.md
+++ b/docs/installation/arch_linux_en.md
@@ -10,6 +10,7 @@ This guide will assume that you have administrative rights, either as root or a
 * `git`
 * `base-devel`
 * `cmake`
+* `file`
 
 #### Optional packages used in this guide
 
@@ -27,7 +28,7 @@ sudo pacman -Syu
 * Install some of the above mentioned programs:
 
 ```shell
-sudo pacman -S git base-devel elixir cmake
+sudo pacman -S git base-devel elixir cmake file
 ```
 
 ### Install PostgreSQL
diff --git a/docs/installation/debian_based_en.md b/docs/installation/debian_based_en.md
index 60c2f47e5..58d15ce14 100644
--- a/docs/installation/debian_based_en.md
+++ b/docs/installation/debian_based_en.md
@@ -10,6 +10,7 @@ This guide will assume you are on Debian Stretch. This guide should also work wi
 * `elixir` (1.8+, Follow the guide to install from the Erlang Solutions repo or use [asdf](https://github.com/asdf-vm/asdf) as the pleroma user)
 * `erlang-dev`
 * `erlang-nox`
+* `libmagic-dev`
 * `git`
 * `build-essential`
 * `cmake`
@@ -31,7 +32,7 @@ sudo apt full-upgrade
 * Install some of the above mentioned programs:
 
 ```shell
-sudo apt install git build-essential postgresql postgresql-contrib cmake
+sudo apt install git build-essential postgresql postgresql-contrib cmake libmagic-devel
 ```
 
 ### Install Elixir and Erlang
diff --git a/docs/installation/debian_based_jp.md b/docs/installation/debian_based_jp.md
index c2dd840d3..d98162796 100644
--- a/docs/installation/debian_based_jp.md
+++ b/docs/installation/debian_based_jp.md
@@ -17,6 +17,7 @@
 - `git`
 - `build-essential`
 - `cmake`
+- `libmagic-dev`
 
 #### このガイドで利用している追加パッケージ
 
@@ -33,7 +34,7 @@ sudo apt full-upgrade
 
 * 上記に挙げたパッケージをインストールしておきます。
 ```
-sudo apt install git build-essential postgresql postgresql-contrib cmake
+sudo apt install git build-essential postgresql postgresql-contrib cmake libmagic-dev
 ```
 
 
diff --git a/docs/installation/gentoo_en.md b/docs/installation/gentoo_en.md
index 5a676380c..0f7ed9d47 100644
--- a/docs/installation/gentoo_en.md
+++ b/docs/installation/gentoo_en.md
@@ -29,6 +29,7 @@ Gentoo quite pointedly does not come with a cron daemon installed, and as such i
 * `dev-lang/elixir`
 * `dev-vcs/git`
 * `dev-util/cmake`
+* `sys-apps/file`
 
 #### Optional ebuilds used in this guide
 
@@ -47,7 +48,7 @@ Gentoo quite pointedly does not come with a cron daemon installed, and as such i
 * Emerge all required the required and suggested software in one go:
 
 ```shell
- # emerge --ask dev-db/postgresql dev-lang/elixir dev-vcs/git www-servers/nginx app-crypt/certbot app-crypt/certbot-nginx dev-util/cmake
+ # emerge --ask dev-db/postgresql dev-lang/elixir dev-vcs/git www-servers/nginx app-crypt/certbot app-crypt/certbot-nginx dev-util/cmake sys-apps/file
 ```
 
 If you would not like to install the optional packages, remove them from this line. 
diff --git a/docs/installation/otp_en.md b/docs/installation/otp_en.md
index b7e3bb2ac..32f04a9c4 100644
--- a/docs/installation/otp_en.md
+++ b/docs/installation/otp_en.md
@@ -27,17 +27,18 @@ Other than things bundled in the OTP release Pleroma depends on:
 * PostgreSQL (also utilizes extensions in postgresql-contrib)
 * nginx (could be swapped with another reverse proxy but this guide covers only it)
 * certbot (for Let's Encrypt certificates, could be swapped with another ACME client, but this guide covers only it)
+* libmagic/file
 
 === "Alpine"
     ```
     echo "http://nl.alpinelinux.org/alpine/latest-stable/community" >> /etc/apk/repositories
     apk update
-    apk add curl unzip ncurses postgresql postgresql-contrib nginx certbot
+    apk add curl unzip ncurses postgresql postgresql-contrib nginx certbot file-dev
     ```
 
 === "Debian/Ubuntu"
     ```
-    apt install curl unzip libncurses5 postgresql postgresql-contrib nginx certbot
+    apt install curl unzip libncurses5 postgresql postgresql-contrib nginx certbot libmagic-dev
     ```
 
 ## Setup