diff --git a/book/src/how_to/derive_the_traits.md b/book/src/how_to/derive_the_traits.md
index 275f067..9b4dc0a 100644
--- a/book/src/how_to/derive_the_traits.md
+++ b/book/src/how_to/derive_the_traits.md
@@ -83,7 +83,7 @@ parameter to `#[derive_float_eq]` with that underlying type (usually `f32` or
     ulps_tol = "PointUlps", 
     ulps_tol_derive = "Clone, Copy, Debug, PartialEq",
     debug_ulps_diff = "PointDebugUlpsDiff",
-    debug_ulps_diflf_derive = "Clone, Copy, Debug, PartialEq",
+    debug_ulps_diff_derive = "Clone, Copy, Debug, PartialEq",
     all_tol = "f64"
 )]
 #[derive(Debug, PartialEq, Clone, Copy)]
@@ -155,4 +155,4 @@ optionally use [AssertFloatEqAll].
 [FloatEqDebugUlpsDiff]: ../../doc/float_eq/trait.FloatEqDebugUlpsDiff.html
 [FloatEqUlpsTol]: ../../doc/float_eq/trait.FloatEqUlpsTol.html
 [How to manually implement the traits]: ./manually_implement_the_traits.md
-[ULPs]: ../background/float_comparison_algorithms.md#units-in-the-last-place-ulps-comparison
\ No newline at end of file
+[ULPs]: ../background/float_comparison_algorithms.md#units-in-the-last-place-ulps-comparison