diff --git a/CHANGELOG.md b/CHANGELOG.md
index a79b2a4..a9f57ae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+- MSRV is now 1.59.0.
 
 ## [v0.5.1] - 2021-11-22
 
diff --git a/src/lib.rs b/src/lib.rs
index 4ce9dbc..dd3461f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -920,8 +920,10 @@ impl LineEvent {
     /// in an interrupt handler so it should be very accurate.
     ///
     /// The nanosecond timestamp value should are captured
-    /// using the `CLOCK_REALTIME` offsets in the kernel and
-    /// should be compared against `CLOCK_REALTIME` values.
+    /// using the `CLOCK_MONOTONIC` offsets in the kernel and
+    /// should be compared against `CLOCK_MONOTONIC` values.
+    /// Note that kernel versions prior to 5.7 used
+    /// `CLOCK_REALTIME` offsets instead.
     pub fn timestamp(&self) -> u64 {
         self.0.timestamp
     }