diff --git a/README.de.md b/README.de.md
index a717d71..5c608a5 100644
--- a/README.de.md
+++ b/README.de.md
@@ -106,6 +106,17 @@ Deutsches Erklärvideo: [Youtube](https://youtu.be/uNDe2wh9SS8?si=b-jYx4I1w62zaO
   - PN532 NFC Modul
   - Verbindungskabel
 
+## Wichtiger Hinweis
+Du musst Spoolman auf DEBUG Modus setzten, da man bisher in Spoolman keine CORS Domains setzen kann!
+
+```
+# Enable debug mode
+# If enabled, the client will accept requests from any host
+# This can be useful when developing, but is also a security risk
+# Default: FALSE
+#SPOOLMAN_DEBUG_MODE=TRUE
+```
+
 ## Schritt-für-Schritt Installation
 ### Einfache Installation
 1. **Gehe auf [FilaMan Installer](https://www.filaman.app/installer.html)**
diff --git a/README.md b/README.md
index 4ebaba2..3979934 100644
--- a/README.md
+++ b/README.md
@@ -110,6 +110,18 @@ german explanatory video: [Youtube](https://youtu.be/uNDe2wh9SS8?si=b-jYx4I1w62z
   - PN532 NFC Module
   - Connecting wires
 
+## Important Note
+You have to activate Spoolman in debug mode, because you are not able to set CORS Domains in Spoolman yet.
+
+```
+# Enable debug mode
+# If enabled, the client will accept requests from any host
+# This can be useful when developing, but is also a security risk
+# Default: FALSE
+#SPOOLMAN_DEBUG_MODE=TRUE
+```
+
+
 ## Step-by-Step Installation
 ### Easy Installation
 1. **Go to [FilaMan Installer](https://www.filaman.app/installer.html)**