diff --git a/README.md b/README.md
index 38fa8ec..025daca 100644
--- a/README.md
+++ b/README.md
@@ -406,6 +406,7 @@ These environment variables allow setting default config values, but can be over
 | WHOOGLE_CONFIG_GET_ONLY        | Search using GET requests only                                  |
 | WHOOGLE_CONFIG_URL             | The root url of the instance (`https://<your url>/`)            |
 | WHOOGLE_CONFIG_STYLE           | The custom CSS to use for styling (should be single line)       |
+| WHOOGLE_CONFIG_PREFERENCES_KEY | Key to encrypt preferences in URL (REQUIRED to show url)        |
 
 ## Usage
 Same as most search engines, with the exception of filtering by time range.
diff --git a/app.json b/app.json
index d1a3f94..2d91d26 100644
--- a/app.json
+++ b/app.json
@@ -174,6 +174,11 @@
         "description": "[CONFIG] Custom CSS styling (paste in CSS or leave blank)",
         "value": ":root { /* LIGHT THEME COLORS */ --whoogle-background: #d8dee9; --whoogle-accent: #2e3440; --whoogle-text: #3B4252; --whoogle-contrast-text: #eceff4; --whoogle-secondary-text: #70757a; --whoogle-result-bg: #fff; --whoogle-result-title: #4c566a; --whoogle-result-url: #81a1c1; --whoogle-result-visited: #a3be8c; /* DARK THEME COLORS */ --whoogle-dark-background: #222; --whoogle-dark-accent: #685e79; --whoogle-dark-text: #fff; --whoogle-dark-contrast-text: #000; --whoogle-dark-secondary-text: #bbb; --whoogle-dark-result-bg: #000; --whoogle-dark-result-title: #1967d2; --whoogle-dark-result-url: #4b11a8; --whoogle-dark-result-visited: #bbbbff; }",
         "required": false
+    },
+    "WHOOGLE_CONFIG_PREFERENCES_KEY": {
+        "description": "[CONFIG] Key to encrypt preferences",
+        "value": "NEEDS_TO_BE_MODIFIED",
+        "required": false
     }
   }
 }
diff --git a/charts/whoogle/values.yaml b/charts/whoogle/values.yaml
index 877adb2..47236c8 100644
--- a/charts/whoogle/values.yaml
+++ b/charts/whoogle/values.yaml
@@ -62,6 +62,7 @@ conf: {}
   # WHOOGLE_CONFIG_GET_ONLY: ""        # Search using GET requests only
   # WHOOGLE_CONFIG_URL: ""             # The root url of the instance (https://<your url>/)
   # WHOOGLE_CONFIG_STYLE: ""           # The custom CSS to use for styling (should be single line)
+  # WHOOGLE_CONFIG_PREFERENCES_KEY: "" # Key to encrypt preferences in URL (REQUIRED to show url) 
 
 podAnnotations: {}
 podSecurityContext: {}
diff --git a/docker-compose-traefik.yaml b/docker-compose-traefik.yaml
index 53680c9..cb2262b 100644
--- a/docker-compose-traefik.yaml
+++ b/docker-compose-traefik.yaml
@@ -72,6 +72,7 @@ services:
       # - WHOOGLE_CONFIG_SEARCH_LANGUAGE=lang_en
       # - WHOOGLE_CONFIG_GET_ONLY=1
       # - WHOOGLE_CONFIG_COUNTRY=FR
+      # - WHOOGLE_CONFIG_PREFERENCES_KEY="NEEDS_TO_BE_MODIFIED"
     #env_file: # Alternatively, load variables from whoogle.env
       #- whoogle.env
     ports:
diff --git a/whoogle.template.env b/whoogle.template.env
index d0bc440..631601c 100644
--- a/whoogle.template.env
+++ b/whoogle.template.env
@@ -85,3 +85,6 @@
 
 # Set custom CSS styling/theming
 #WHOOGLE_CONFIG_STYLE=":root { /* LIGHT THEME COLORS */ --whoogle-background: #d8dee9; --whoogle-accent: #2e3440; --whoogle-text: #3B4252; --whoogle-contrast-text: #eceff4; --whoogle-secondary-text: #70757a; --whoogle-result-bg: #fff; --whoogle-result-title: #4c566a; --whoogle-result-url: #81a1c1; --whoogle-result-visited: #a3be8c; /* DARK THEME COLORS */ --whoogle-dark-background: #222; --whoogle-dark-accent: #685e79; --whoogle-dark-text: #fff; --whoogle-dark-contrast-text: #000; --whoogle-dark-secondary-text: #bbb; --whoogle-dark-result-bg: #000; --whoogle-dark-result-title: #1967d2; --whoogle-dark-result-url: #4b11a8; --whoogle-dark-result-visited: #bbbbff; }"
+
+# Set Key to encode config in url
+#WHOOGLE_CONFIG_PREFERENCES_KEY="NEEDS_TO_BE_MODIFIED"
\ No newline at end of file