diff --git a/library/std/src/f32.rs b/library/std/src/f32.rs
index a659b552f47..776899dbcfd 100644
--- a/library/std/src/f32.rs
+++ b/library/std/src/f32.rs
@@ -822,6 +822,7 @@ impl f32 {
     ///
     /// assert!(abs_difference < 1e-10);
     /// ```
+    #[doc(alias = "log1p")]
     #[rustc_allow_incoherent_impl]
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/library/std/src/f64.rs b/library/std/src/f64.rs
index 721e1fb754e..4f4f5f02471 100644
--- a/library/std/src/f64.rs
+++ b/library/std/src/f64.rs
@@ -822,6 +822,7 @@ impl f64 {
     ///
     /// assert!(abs_difference < 1e-20);
     /// ```
+    #[doc(alias = "log1p")]
     #[rustc_allow_incoherent_impl]
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[stable(feature = "rust1", since = "1.0.0")]