diff --git a/README.md b/README.md
index a5a2740..73f548b 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 My customization recipe for SystemRescue:
 ===================================================
 ## Dependencies
-squashfs-tools, xorriso (provided by dev-libs/libisoburn package in gentoo GNU/Linux) and
+squashfs-tools, xorriso (provided by dev-libs/libisoburn package in gentoo GNU/Linux - WARNING: requires zstd USE flag enabled) and
 [sysrescue-customize.sh](https://gitlab.com/systemrescue/systemrescue-sources/-/raw/main/airootfs/usr/share/sysrescue/bin/sysrescue-customize?inline=false)
 are required to apply these customizations