From 7e055b131f61829decd64382d98732ebe016c080 Mon Sep 17 00:00:00 2001
From: Josh Stone <cuviper@gmail.com>
Date: Tue, 8 May 2018 17:35:59 -0700
Subject: [PATCH] Document more impls that require std

---
 README.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 3aab842..2c16617 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,9 @@ default-features = false
 ```
 
 The `Float` and `Real` traits are only available when `std` is enabled. The
-`FloatCore` trait is always available.
+`FloatCore` trait is always available.  `MulAdd` and `MulAddAssign` for `f32`
+and `f64` also require `std`, as do implementations of signed and floating-
+point exponents in `Pow`.
 
 Implementations for `i128` and `u128` are only available when `i128` is enabled.