diff --git a/Cargo.toml b/Cargo.toml
index c21beae..f38fb58 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ms-converter"
-version = "0.7.0"
+version = "0.7.1"
 authors = ["Mnwa <mihan@panfilov.biz>"]
 edition = "2018"
 description = "Fast abstraction for converting human-like times into milliseconds."
diff --git a/src/lib.rs b/src/lib.rs
index c06f324..cbc4808 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -5,11 +5,17 @@
 use std::fmt::Formatter;
 use std::time::Duration;
 
+/// How many milliseconds in one second
 pub const SECOND: f64 = 1000_f64;
+/// How many milliseconds in one minute
 pub const MINUTE: f64 = SECOND * 60_f64;
+/// How many milliseconds in one hour
 pub const HOUR: f64 = MINUTE * 60_f64;
+/// How many milliseconds in one day
 pub const DAY: f64 = HOUR * 24_f64;
+/// How many milliseconds in one week
 pub const WEEK: f64 = DAY * 7_f64;
+/// How many milliseconds in one year
 pub const YEAR: f64 = DAY * 365.25_f64;
 
 /// Fast abstraction for converting human-like times into milliseconds.
@@ -127,6 +133,7 @@ pub fn ms_into_time(s: &str) -> Result<Duration, Error> {
     Ok(Duration::from_millis(milliseconds as u64))
 }
 
+/// Error what return ms converter functions in runtime, if something is going wrong.
 #[derive(Debug)]
 pub struct Error {
     message: &'static str,