diff --git a/lib/runtime-core/src/backend.rs b/lib/runtime-core/src/backend.rs
index 49b4161e4..eabe526d8 100644
--- a/lib/runtime-core/src/backend.rs
+++ b/lib/runtime-core/src/backend.rs
@@ -132,8 +132,8 @@ pub struct CompilerConfig {
     /// When enabled there can be a small amount of runtime performance overhead.
     pub full_preemption: bool,
 
-    /// Whether to enable spec-compliant NaN canonicalization at all places.
-    /// Enabling this increases runtime overhead.
+    /// Always choose a unique bit representation for NaN.
+    /// Enabling this makes execution deterministic but increases runtime overhead.
     pub nan_canonicalization: bool,
 
     pub features: Features,