diff --git a/crates/nu-cmd-base/src/util.rs b/crates/nu-cmd-base/src/util.rs
index 9c63dec836..0e242596e5 100644
--- a/crates/nu-cmd-base/src/util.rs
+++ b/crates/nu-cmd-base/src/util.rs
@@ -20,6 +20,7 @@ pub fn get_guaranteed_cwd(engine_state: &EngineState, stack: &Stack) -> PathBuf
 
 type MakeRangeError = fn(&str, Span) -> ShellError;
 
+/// Returns a inclusively pair of boundary in given `range`.
 pub fn process_range(range: &Range) -> Result<(isize, isize), MakeRangeError> {
     match range {
         Range::IntRange(range) => {