diff --git a/build.rs b/build.rs
index 7091f9c..4d0ae26 100644
--- a/build.rs
+++ b/build.rs
@@ -1,7 +1,7 @@
 fn main() {
     let ac = autocfg::new();
 
-    ac.emit_expression_cfg("1f64.total_cmp(&2f64)", "has_total_cmp");
+    ac.emit_expression_cfg("1f64.total_cmp(&2f64)", "has_total_cmp"); // 1.62
 
     ac.emit_expression_cfg("1u32.to_ne_bytes()", "has_int_to_from_bytes");
     ac.emit_expression_cfg("3.14f64.to_ne_bytes()", "has_float_to_from_bytes");