diff --git a/tools/buildsys/src/manifest.rs b/tools/buildsys/src/manifest.rs
index 259c1a74..e68af3de 100644
--- a/tools/buildsys/src/manifest.rs
+++ b/tools/buildsys/src/manifest.rs
@@ -498,6 +498,11 @@ impl ManifestInfo {
                 }
             }
         }
+        for experiment in EXPERIMENTAL_IMAGE_FEATURES {
+            if features.contains(experiment) {
+                println!("cargo:warning=Image feature {experiment} is experimental; use at your own risk!");
+            }
+        }
         Some(features)
     }
 
@@ -797,6 +802,8 @@ pub enum ImageFeature {
     HostContainers,
 }
 
+const EXPERIMENTAL_IMAGE_FEATURES: [&ImageFeature; 1] = [&ImageFeature::ErofsRootPartition];
+
 impl TryFrom<String> for ImageFeature {
     type Error = Error;
     fn try_from(s: String) -> Result<Self> {