diff --git a/docs/docker.md b/docs/docker.md
index 0d3e00e..1b2474a 100644
--- a/docs/docker.md
+++ b/docs/docker.md
@@ -11,7 +11,10 @@ Although WinApps supports using `QEMU+KVM+libvirt` as a backend for running Wind
 > - It is recommended to edit the initial `compose.yaml` file to keep your required username and password from the beginning.
 > - It is recommended to not use `sudo` to force commands to run. Add your user to the relevant permissions group wherever possible.
 
-
+> [!IMPORTANT]
+> The iptables kernel module must be loaded for folder sharing with the host to work.
+> Check that the output of `lsmod | grep ip_tables` and `lsmod | grep iptable_nat` is non empty.
+> If it is, run `echo -e "ip_tables\niptable_nat" | sudo tee /etc/modules-load.d/iptables.conf` and reboot.
 
 ## `Docker`
 ### Installation