diff --git a/query-engine/core/src/interactive_transactions/mod.rs b/query-engine/core/src/interactive_transactions/mod.rs
index 1f99c1f6f0cb..d3c73f705123 100644
--- a/query-engine/core/src/interactive_transactions/mod.rs
+++ b/query-engine/core/src/interactive_transactions/mod.rs
@@ -57,6 +57,8 @@ where
 {
     fn from(s: T) -> Self {
         let contents = s.into();
+        // This postcondition is to ensure that the TxId is long enough as to be able to derive
+        // a TraceId from it.
         assert!(
             contents.len() >= MINIMUM_TX_ID_LENGTH,
             "minimum length for a TxId ({}) is {}, but was {}",