diff --git a/src/runtime.rs b/src/runtime.rs
index d8e2da66..b6350020 100644
--- a/src/runtime.rs
+++ b/src/runtime.rs
@@ -337,9 +337,9 @@ impl Runtime {
         // form again.
         cycle_query.remove_cycle_participants(&cycle);
 
-        // Mark the cycle participants so they know to recover.
-        // This only matters for queries that have a fallback value specified;
-        // the others will just unwind without storing any recovery information.
+        // Mark each cycle participant that has recovery set, along with
+        // any frames that come after them on the same thread. Those frames
+        // are going to be unwound so that fallback can occur.
         dg.for_each_cycle_participant(from_id, &mut from_stack, database_key_index, to_id, |aqs| {
             aqs.iter_mut()
                 .skip_while(
diff --git a/src/runtime/dependency_graph.rs b/src/runtime/dependency_graph.rs
index 462cdd3b..1e2c6471 100644
--- a/src/runtime/dependency_graph.rs
+++ b/src/runtime/dependency_graph.rs
@@ -121,14 +121,12 @@ impl DependencyGraph {
         closure(&mut from_stack[prefix..]);
     }
 
-    /// For each runtime that is blocked as part of this cycle excluding the current one,
-    /// execute `should_unblock` with its portion of the stack. If that function returns true,
-    /// then unblocks the given edge. The function is also invoked on the current runtime,
-    /// but in that case the return value (true or false) is simply returned directly as part
-    /// of the return tuple, since it is up to the caller to "unblock" or "block".
+    /// Unblock each blocked runtime (excluding the current one) if some
+    /// query executing in that runtime is participating in cycle fallback.
     ///
     /// Returns a boolean (Current, Others) where:
-    /// * Current is true if the current runtime should be unblocked and
+    /// * Current is true if the current runtime has cycle participants
+    ///   with fallback;
     /// * Others is true if other runtimes were unblocked.
     pub(super) fn maybe_unblock_runtimes_in_cycle(
         &mut self,