diff --git a/crates/miroir-core/src/router.rs b/crates/miroir-core/src/router.rs
index 450aa29..9e6a37e 100644
--- a/crates/miroir-core/src/router.rs
+++ b/crates/miroir-core/src/router.rs
@@ -174,12 +174,12 @@ mod tests {
         // Debug: print actual distribution
         eprintln!("Actual shard distribution: {node_shard_counts:?}");
 
-        // DoD requirement: each node holds 15–27 shards
-        // This accommodates natural variance in hash-based distribution
+        // DoD requirement: each node holds 18–26 shards
+        // This is the expected range for HRW with 64 shards / 3 nodes / RF=1
         for (node, count) in &node_shard_counts {
             assert!(
-                *count >= 15 && *count <= 27,
-                "Node {node} has {count} shards, expected 15–27"
+                *count >= 18 && *count <= 26,
+                "Node {node} has {count} shards, expected 18–26"
             );
         }
 
@@ -655,11 +655,11 @@ mod tests {
             }
         }
 
-        // DoD requirement: each node holds 15–27 shards
+        // DoD requirement: each node holds 18–26 shards
         for (node, count) in &node_shard_counts {
             assert!(
-                *count >= 15 && *count <= 27,
-                "Node {node} has {count} shards, expected 15–27"
+                *count >= 18 && *count <= 26,
+                "Node {node} has {count} shards, expected 18–26"
             );
         }