diff --git a/backend/telemetry_core/src/state/chain.rs b/backend/telemetry_core/src/state/chain.rs
index d5df95b..9cb3e46 100644
--- a/backend/telemetry_core/src/state/chain.rs
+++ b/backend/telemetry_core/src/state/chain.rs
@@ -96,16 +96,16 @@ impl Chain {
         }
     }
 
-    /// Can we add a node? If not, it's because the chain is at its quota.
+    /// Is the chain the node belongs to overquota?
     pub fn is_overquota(&self) -> bool {
         // Dynamically determine the max nodes based on the most common
         // label so far, in case it changes to something with a different limit.
-        self.nodes.len() < max_nodes(self.labels.best())
+        self.nodes.len() >= max_nodes(self.labels.best())
     }
 
     /// Assign a node to this chain.
     pub fn add_node(&mut self, node: Node) -> AddNodeResult {
-        if !self.is_overquota() {
+        if self.is_overquota() {
             return AddNodeResult::Overquota;
         }
 
diff --git a/backend/telemetry_core/tests/e2e_tests.rs b/backend/telemetry_core/tests/e2e_tests.rs
index 49cfd3c..8fdc639 100644
--- a/backend/telemetry_core/tests/e2e_tests.rs
+++ b/backend/telemetry_core/tests/e2e_tests.rs
@@ -637,7 +637,7 @@ async fn slow_feeds_are_disconnected() {
     tokio::time::sleep(Duration::from_secs(5)).await;
 
     // Drain anything out and expect to hit a "closed" error, rather than get stuck
-    // waiting to receive mroe data (or see some other error).
+    // waiting to receive more data (or see some other error).
     loop {
         let mut v = Vec::new();
         let data =