diff --git a/src/dstack/_internal/core/backends/base/offers.py b/src/dstack/_internal/core/backends/base/offers.py
index c8236002b..4ecc73bef 100644
--- a/src/dstack/_internal/core/backends/base/offers.py
+++ b/src/dstack/_internal/core/backends/base/offers.py
@@ -225,6 +225,7 @@ def modifier(offer: InstanceOfferWithAvailability) -> Optional[InstanceOfferWith
         offer_copy.instance.resources.disk = Disk(
             size_mib=get_or_error(disk_size_range.min) * 1024
         )
+        offer_copy.instance.resources.update_description()
         return offer_copy
 
     return modifier
diff --git a/src/dstack/_internal/core/models/instances.py b/src/dstack/_internal/core/models/instances.py
index f814cdaea..bfe01c98b 100644
--- a/src/dstack/_internal/core/models/instances.py
+++ b/src/dstack/_internal/core/models/instances.py
@@ -52,9 +52,9 @@ class Resources(CoreModel):
     gpus: List[Gpu]
     spot: bool
     disk: Disk = Disk(size_mib=102400)  # the default value (100GB) for backward compatibility
+    cpu_arch: Optional[gpuhunt.CPUArchitecture] = None
     # TODO: make description a computed field after migrating to pydanticV2
     description: str = ""
-    cpu_arch: Optional[gpuhunt.CPUArchitecture] = None
 
     @root_validator
     def _description(cls, values) -> Dict:
@@ -68,12 +68,44 @@ def _description(cls, values) -> Dict:
                 spot = values["spot"]
                 cpu_arch = values["cpu_arch"]
                 values["description"] = Resources._pretty_format(
-                    cpus, cpu_arch, memory_mib, disk_size_mib, gpus, spot, include_spot=True
+                    cpus=cpus,
+                    cpu_arch=cpu_arch,
+                    memory_mib=memory_mib,
+                    disk_size_mib=disk_size_mib,
+                    gpus=gpus,
+                    spot=spot,
+                    include_spot=True,
                 )
         except KeyError:
             return values
         return values
 
+    def pretty_format(self, include_spot: bool = False, gpu_only: bool = False) -> str:
+        return Resources._pretty_format(
+            self.cpus,
+            self.cpu_arch,
+            self.memory_mib,
+            self.disk.size_mib,
+            self.gpus,
+            self.spot,
+            include_spot,
+            gpu_only,
+        )
+
+    def update_description(self):
+        """
+        Call to update `description` after patching other properties.
+        """
+        self.description = Resources._pretty_format(
+            cpus=self.cpus,
+            cpu_arch=self.cpu_arch,
+            memory_mib=self.memory_mib,
+            disk_size_mib=self.disk.size_mib,
+            gpus=self.gpus,
+            spot=self.spot,
+            include_spot=True,
+        )
+
     @staticmethod
     def _pretty_format(
         cpus: int,
@@ -119,18 +151,6 @@ def _pretty_format(
             output += " (spot)"
         return output
 
-    def pretty_format(self, include_spot: bool = False, gpu_only: bool = False) -> str:
-        return Resources._pretty_format(
-            self.cpus,
-            self.cpu_arch,
-            self.memory_mib,
-            self.disk.size_mib,
-            self.gpus,
-            self.spot,
-            include_spot,
-            gpu_only,
-        )
-
 
 class InstanceType(CoreModel):
     name: str