diff --git a/src/round.rs b/src/round.rs
index fc9ff1d..fcdd01e 100644
--- a/src/round.rs
+++ b/src/round.rs
@@ -15,17 +15,33 @@ pub trait SubSecondRound {
     /// Return a copy rounded to the specified number of subsecond digits. With
     /// 9 or more digits, self is returned unmodified. Halfway values are
     /// rounded up (away from zero).
-    fn round(self, digits: u16) -> Self;
+    ///
+    /// # Example
+    /// ``` rust
+    /// # use chrono::{DateTime, SubSecondRound, Timelike, TimeZone, Utc};
+    /// let dt = Utc.ymd(2018, 1, 11).and_hms_milli(12, 0, 0, 154);
+    /// assert_eq!(dt.round_subsecs(2).nanosecond(), 150_000_000);
+    /// assert_eq!(dt.round_subsecs(1).nanosecond(), 200_000_000);
+    /// ```
+    fn round_subsecs(self, digits: u16) -> Self;
 
     /// Return a copy truncated to the specified number of subsecond
     /// digits. With 9 or more digits, self is returned unmodified.
-    fn trunc(self, digits: u16) -> Self;
+    ///
+    /// # Example
+    /// ``` rust
+    /// # use chrono::{DateTime, SubSecondRound, Timelike, TimeZone, Utc};
+    /// let dt = Utc.ymd(2018, 1, 11).and_hms_milli(12, 0, 0, 154);
+    /// assert_eq!(dt.trunc_subsecs(2).nanosecond(), 150_000_000);
+    /// assert_eq!(dt.trunc_subsecs(1).nanosecond(), 100_000_000);
+    /// ```
+    fn trunc_subsecs(self, digits: u16) -> Self;
 }
 
 impl<T> SubSecondRound for T
 where T: Timelike + Add<Duration, Output=T> + Sub<Duration, Output=T>
 {
-    fn round(self, digits: u16) -> T {
+    fn round_subsecs(self, digits: u16) -> T {
         let span = span_for_digits(digits);
         let delta_down = self.nanosecond() % span;
         if delta_down > 0 {
@@ -40,7 +56,7 @@ where T: Timelike + Add<Duration, Output=T> + Sub<Duration, Output=T>
         }
     }
 
-    fn trunc(self, digits: u16) -> T {
+    fn trunc_subsecs(self, digits: u16) -> T {
         let span = span_for_digits(digits);
         let delta_down = self.nanosecond() % span;
         if delta_down > 0 {
@@ -79,42 +95,42 @@ mod tests {
         let pst = FixedOffset::east(8 * 60 * 60);
         let dt = pst.ymd(2018, 1, 11).and_hms_nano(10, 5, 13, 084_660_684);
 
-        assert_eq!(dt.round(10), dt);
-        assert_eq!(dt.round(9), dt);
-        assert_eq!(dt.round(8).nanosecond(), 084_660_680);
-        assert_eq!(dt.round(7).nanosecond(), 084_660_700);
-        assert_eq!(dt.round(6).nanosecond(), 084_661_000);
-        assert_eq!(dt.round(5).nanosecond(), 084_660_000);
-        assert_eq!(dt.round(4).nanosecond(), 084_700_000);
-        assert_eq!(dt.round(3).nanosecond(), 085_000_000);
-        assert_eq!(dt.round(2).nanosecond(), 080_000_000);
-        assert_eq!(dt.round(1).nanosecond(), 100_000_000);
+        assert_eq!(dt.round_subsecs(10), dt);
+        assert_eq!(dt.round_subsecs(9), dt);
+        assert_eq!(dt.round_subsecs(8).nanosecond(), 084_660_680);
+        assert_eq!(dt.round_subsecs(7).nanosecond(), 084_660_700);
+        assert_eq!(dt.round_subsecs(6).nanosecond(), 084_661_000);
+        assert_eq!(dt.round_subsecs(5).nanosecond(), 084_660_000);
+        assert_eq!(dt.round_subsecs(4).nanosecond(), 084_700_000);
+        assert_eq!(dt.round_subsecs(3).nanosecond(), 085_000_000);
+        assert_eq!(dt.round_subsecs(2).nanosecond(), 080_000_000);
+        assert_eq!(dt.round_subsecs(1).nanosecond(), 100_000_000);
 
-        assert_eq!(dt.round(0).nanosecond(), 0);
-        assert_eq!(dt.round(0).second(), 13);
+        assert_eq!(dt.round_subsecs(0).nanosecond(), 0);
+        assert_eq!(dt.round_subsecs(0).second(), 13);
 
         let dt = Utc.ymd(2018, 1, 11).and_hms_nano(10, 5, 27, 750_500_000);
-        assert_eq!(dt.round(9), dt);
-        assert_eq!(dt.round(4), dt);
-        assert_eq!(dt.round(3).nanosecond(), 751_000_000);
-        assert_eq!(dt.round(2).nanosecond(), 750_000_000);
-        assert_eq!(dt.round(1).nanosecond(), 800_000_000);
+        assert_eq!(dt.round_subsecs(9), dt);
+        assert_eq!(dt.round_subsecs(4), dt);
+        assert_eq!(dt.round_subsecs(3).nanosecond(), 751_000_000);
+        assert_eq!(dt.round_subsecs(2).nanosecond(), 750_000_000);
+        assert_eq!(dt.round_subsecs(1).nanosecond(), 800_000_000);
 
-        assert_eq!(dt.round(0).nanosecond(), 0);
-        assert_eq!(dt.round(0).second(), 28);
+        assert_eq!(dt.round_subsecs(0).nanosecond(), 0);
+        assert_eq!(dt.round_subsecs(0).second(), 28);
     }
 
     #[test]
     fn test_round_leap_nanos() {
         let dt = Utc.ymd(2016, 12, 31).and_hms_nano(23, 59, 59, 1_750_500_000);
-        assert_eq!(dt.round(9), dt);
-        assert_eq!(dt.round(4), dt);
-        assert_eq!(dt.round(2).nanosecond(), 1_750_000_000);
-        assert_eq!(dt.round(1).nanosecond(), 1_800_000_000);
-        assert_eq!(dt.round(1).second(), 59);
+        assert_eq!(dt.round_subsecs(9), dt);
+        assert_eq!(dt.round_subsecs(4), dt);
+        assert_eq!(dt.round_subsecs(2).nanosecond(), 1_750_000_000);
+        assert_eq!(dt.round_subsecs(1).nanosecond(), 1_800_000_000);
+        assert_eq!(dt.round_subsecs(1).second(), 59);
 
-        assert_eq!(dt.round(0).nanosecond(), 0);
-        assert_eq!(dt.round(0).second(), 0);
+        assert_eq!(dt.round_subsecs(0).nanosecond(), 0);
+        assert_eq!(dt.round_subsecs(0).second(), 0);
     }
 
     #[test]
@@ -122,41 +138,41 @@ mod tests {
         let pst = FixedOffset::east(8 * 60 * 60);
         let dt = pst.ymd(2018, 1, 11).and_hms_nano(10, 5, 13, 084_660_684);
 
-        assert_eq!(dt.trunc(10), dt);
-        assert_eq!(dt.trunc(9), dt);
-        assert_eq!(dt.trunc(8).nanosecond(), 084_660_680);
-        assert_eq!(dt.trunc(7).nanosecond(), 084_660_600);
-        assert_eq!(dt.trunc(6).nanosecond(), 084_660_000);
-        assert_eq!(dt.trunc(5).nanosecond(), 084_660_000);
-        assert_eq!(dt.trunc(4).nanosecond(), 084_600_000);
-        assert_eq!(dt.trunc(3).nanosecond(), 084_000_000);
-        assert_eq!(dt.trunc(2).nanosecond(), 080_000_000);
-        assert_eq!(dt.trunc(1).nanosecond(), 0);
+        assert_eq!(dt.trunc_subsecs(10), dt);
+        assert_eq!(dt.trunc_subsecs(9), dt);
+        assert_eq!(dt.trunc_subsecs(8).nanosecond(), 084_660_680);
+        assert_eq!(dt.trunc_subsecs(7).nanosecond(), 084_660_600);
+        assert_eq!(dt.trunc_subsecs(6).nanosecond(), 084_660_000);
+        assert_eq!(dt.trunc_subsecs(5).nanosecond(), 084_660_000);
+        assert_eq!(dt.trunc_subsecs(4).nanosecond(), 084_600_000);
+        assert_eq!(dt.trunc_subsecs(3).nanosecond(), 084_000_000);
+        assert_eq!(dt.trunc_subsecs(2).nanosecond(), 080_000_000);
+        assert_eq!(dt.trunc_subsecs(1).nanosecond(), 0);
 
-        assert_eq!(dt.trunc(0).nanosecond(), 0);
-        assert_eq!(dt.trunc(0).second(), 13);
+        assert_eq!(dt.trunc_subsecs(0).nanosecond(), 0);
+        assert_eq!(dt.trunc_subsecs(0).second(), 13);
 
         let dt = pst.ymd(2018, 1, 11).and_hms_nano(10, 5, 27, 750_500_000);
-        assert_eq!(dt.trunc(9), dt);
-        assert_eq!(dt.trunc(4), dt);
-        assert_eq!(dt.trunc(3).nanosecond(), 750_000_000);
-        assert_eq!(dt.trunc(2).nanosecond(), 750_000_000);
-        assert_eq!(dt.trunc(1).nanosecond(), 700_000_000);
+        assert_eq!(dt.trunc_subsecs(9), dt);
+        assert_eq!(dt.trunc_subsecs(4), dt);
+        assert_eq!(dt.trunc_subsecs(3).nanosecond(), 750_000_000);
+        assert_eq!(dt.trunc_subsecs(2).nanosecond(), 750_000_000);
+        assert_eq!(dt.trunc_subsecs(1).nanosecond(), 700_000_000);
 
-        assert_eq!(dt.trunc(0).nanosecond(), 0);
-        assert_eq!(dt.trunc(0).second(), 27);
+        assert_eq!(dt.trunc_subsecs(0).nanosecond(), 0);
+        assert_eq!(dt.trunc_subsecs(0).second(), 27);
     }
 
     #[test]
     fn test_trunc_leap_nanos() {
         let dt = Utc.ymd(2016, 12, 31).and_hms_nano(23, 59, 59, 1_750_500_000);
-        assert_eq!(dt.trunc(9), dt);
-        assert_eq!(dt.trunc(4), dt);
-        assert_eq!(dt.trunc(2).nanosecond(), 1_750_000_000);
-        assert_eq!(dt.trunc(1).nanosecond(), 1_700_000_000);
-        assert_eq!(dt.trunc(1).second(), 59);
+        assert_eq!(dt.trunc_subsecs(9), dt);
+        assert_eq!(dt.trunc_subsecs(4), dt);
+        assert_eq!(dt.trunc_subsecs(2).nanosecond(), 1_750_000_000);
+        assert_eq!(dt.trunc_subsecs(1).nanosecond(), 1_700_000_000);
+        assert_eq!(dt.trunc_subsecs(1).second(), 59);
 
-        assert_eq!(dt.trunc(0).nanosecond(), 1_000_000_000);
-        assert_eq!(dt.trunc(0).second(), 59);
+        assert_eq!(dt.trunc_subsecs(0).nanosecond(), 1_000_000_000);
+        assert_eq!(dt.trunc_subsecs(0).second(), 59);
     }
 }