3 files changed, 10 insertions, 5 deletions
diff --git a/library/std/src/f32.rs b/library/std/src/f32.rs
index c7c33678fd3..408244b2ce9 100644
--- a/library/std/src/f32.rs
+++ b/library/std/src/f32.rs
@@ -581,8 +581,10 @@ impl f32 {
         unsafe { cmath::cbrtf(self) }
     }
 
-    /// Calculates the length of the hypotenuse of a right-angle triangle given
-    /// legs of length `x` and `y`.
+    /// Compute the distance between the origin and a point (`x`, `y`) on the
+    /// Euclidean plane. Equivalently, compute the length of the hypotenuse of a
+    /// right-angle triangle with other sides having length `x.abs()` and
+    /// `y.abs()`.
     ///
     /// # Examples
     ///
diff --git a/library/std/src/f64.rs b/library/std/src/f64.rs
index b1faa670307..6782b861f11 100644
--- a/library/std/src/f64.rs
+++ b/library/std/src/f64.rs
@@ -583,8 +583,10 @@ impl f64 {
         unsafe { cmath::cbrt(self) }
     }
 
-    /// Calculates the length of the hypotenuse of a right-angle triangle given
-    /// legs of length `x` and `y`.
+    /// Compute the distance between the origin and a point (`x`, `y`) on the
+    /// Euclidean plane. Equivalently, compute the length of the hypotenuse of a
+    /// right-angle triangle with other sides having length `x.abs()` and
+    /// `y.abs()`.
     ///
     /// # Examples
     ///
diff --git a/library/std/src/thread/mod.rs b/library/std/src/thread/mod.rs
index b9aaf5f6e15..13b845b25c9 100644
--- a/library/std/src/thread/mod.rs
+++ b/library/std/src/thread/mod.rs
@@ -131,7 +131,8 @@
 //!
 //! * Build the thread with [`Builder`] and pass the desired stack size to [`Builder::stack_size`].
 //! * Set the `RUST_MIN_STACK` environment variable to an integer representing the desired stack
-//!   size (in bytes). Note that setting [`Builder::stack_size`] will override this.
+//!   size (in bytes). Note that setting [`Builder::stack_size`] will override this. Be aware that
+//!   changes to `RUST_MIN_STACK` may be ignored after program start.
 //!
 //! Note that the stack size of the main thread is *not* determined by Rust.
 //!