diff --git a/dev/manually/README.md b/dev/manually/README.md
index 088f48c966..e0c3bf6aee 100644
--- a/dev/manually/README.md
+++ b/dev/manually/README.md
@@ -111,6 +111,13 @@ sudo apt update
 sudo apt install -y -V redis python3 build-essential
 ```
 
+## Install optional ffmpeg dependencies
+
+```sh
+sudo apt update
+sudo apt install -y -V ffmpeg
+```
+
 ## Download and configuration Firefish
 
 1. Download Firefish and Copy example configuration file.
diff --git a/docs/install.md b/docs/install.md
index 3af96f9a2e..a603046b99 100644
--- a/docs/install.md
+++ b/docs/install.md
@@ -165,6 +165,13 @@ example.tld {
 
 3. Running `sudo systemctl restart caddy` to apply.
 
+## Install optional ffmpeg dependencies
+
+```sh
+sudo apt update
+sudo apt install -y -V ffmpeg
+```
+
 ## Download and configuration Firefish
 
 1. Download Firefish and Copy example configuration file.