diff --git a/CHANGELOG.md b/CHANGELOG.md
index e5eb0c6..e267eff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## Unreleased
 
+## 0.2.0
+
+- Add `std::error::Error` trait to `CmdError` ()
+
 ## 0.1.3
 
 - Update docs on crates.io (https://github.com/schneems/fun_run/pull/7)
diff --git a/src/lib.rs b/src/lib.rs
index abb6eaf..14c863e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -356,6 +356,15 @@ impl Display for CmdError {
     }
 }
 
+impl std::error::Error for CmdError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            CmdError::SystemError(_, io_err) => Some(io_err),
+            CmdError::NonZeroExitNotStreamed(_) | CmdError::NonZeroExitAlreadyStreamed(_) => None,
+        }
+    }
+}
+
 impl CmdError {
     /// Returns a display representation of the command that failed
     ///