diff --git a/aleph_message/models/execution/environment.py b/aleph_message/models/execution/environment.py
index 1e97073..8b6a428 100644
--- a/aleph_message/models/execution/environment.py
+++ b/aleph_message/models/execution/environment.py
@@ -77,6 +77,10 @@ class CpuProperties(HashableModel):
     vendor: Optional[Union[Literal["AuthenticAMD", "GenuineIntel"], str]] = Field(
         default=None, description="CPU vendor. Allows other vendors."
     )
+    # Features described here differ from the CPU flags (/proc/cpuinfo) since they must be actually available to the VM.
+    features: Optional[List[str]] = Field(
+        default=None, description="CPU features required. Examples: 'avx2', 'sev_es', 'sev_snp'.",
+    )
 
     class Config:
         extra = Extra.forbid