diff --git a/README.md b/README.md
index 2a29af5..d36f4fd 100644
--- a/README.md
+++ b/README.md
@@ -70,13 +70,12 @@ fn write<W: io::Write, V: itoa::Integer>(writer: W, value: V) -> io::Result<usiz
 fn fmt<W: fmt::Write, V: itoa::Integer>(writer: W, value: V) -> fmt::Result;
 ```
 
-where `itoa::Integer` is implemented for `i8`, `u8`, `i16`, `u16`, `i32`, `u32`,
-`i64`, `u64`, `i128`, `u128`, `isize` and `usize`. 128-bit integer support is
-only available with the nightly compiler when the `i128` feature is enabled for
-this crate. The return value gives the number of bytes written.
+where `itoa::Integer` is implemented for i8, u8, i16, u16, i32, u32, i64, u64,
+i128, u128, isize and usize. 128-bit integer support requires rustc 1.26+ and
+the `i128` feature of this crate enabled.
 
 The `write` function is only available when the `std` feature is enabled
-(default is enabled).
+(default is enabled). The return value gives the number of bytes written.
 
 <br>