diff --git a/gpx-rs/engine/src/engine/command/command.rs b/gpx-rs/engine/src/engine/command/command.rs
index 935987ac1..68037faec 100644
--- a/gpx-rs/engine/src/engine/command/command.rs
+++ b/gpx-rs/engine/src/engine/command/command.rs
@@ -1,9 +1,9 @@
-use crate::{
-    Append, Clean, Crop, Delete, DeleteAll, Duplicate, Elevation, Extract, Load, Merge, Metadata,
-    MoveWaypoint, New, NewTrack, NewTrackSegment, NewWaypoint, Replace, Reverse, Split, Style,
-    Time,
-};
 use crate::{Apply, CommandError, State};
+use crate::{
+    Clean, Crop, Delete, DeleteAll, Duplicate, Elevation, Extract, Load, Merge, Metadata,
+    MoveWaypoint, New, NewTrack, NewTrackSegment, NewWaypoint, Reverse, SpliceTrackpoints, Split,
+    Style, Time,
+};
 
 /// A user action that edits the files. Each variant wraps the command's own struct, whose
 /// effect is implemented in its own file (see `Apply`).
@@ -22,8 +22,7 @@ pub enum Command<'a> {
     NewTrack(NewTrack),
     NewTrackSegment(NewTrackSegment),
     Reverse(Reverse),
-    Append(Append<'a>),
-    Replace(Replace<'a>),
+    SpliceTrackpoints(SpliceTrackpoints<'a>),
     NewWaypoint(NewWaypoint<'a>),
     MoveWaypoint(MoveWaypoint),
     Crop(Crop),
@@ -48,8 +47,7 @@ impl Apply for Command<'_> {
             Command::NewTrack(c) => c.apply(state),
             Command::NewTrackSegment(c) => c.apply(state),
             Command::Reverse(c) => c.apply(state),
-            Command::Append(c) => c.apply(state),
-            Command::Replace(c) => c.apply(state),
+            Command::SpliceTrackpoints(c) => c.apply(state),
             Command::NewWaypoint(c) => c.apply(state),
             Command::MoveWaypoint(c) => c.apply(state),
             Command::Crop(c) => c.apply(state),
diff --git a/gpx-rs/engine/src/engine/command/tools/append.rs b/gpx-rs/engine/src/engine/command/tools/append.rs
deleted file mode 100644
index 91b86d829..000000000
--- a/gpx-rs/engine/src/engine/command/tools/append.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-use crate::{Apply, CommandError, State};
-
-#[derive(Debug)]
-pub struct Append<'a> {
-    pub lng: &'a [f64],
-    pub lat: &'a [f64],
-    pub ele: &'a [f64],
-}
-
-impl Apply for Append<'_> {
-    fn apply(self, _state: &mut State) -> Result<(), CommandError> {
-        // TODO
-        Err(CommandError::NotImplemented("append"))
-    }
-}
diff --git a/gpx-rs/engine/src/engine/command/tools/mod.rs b/gpx-rs/engine/src/engine/command/tools/mod.rs
index 48550ddec..ab19aea2b 100644
--- a/gpx-rs/engine/src/engine/command/tools/mod.rs
+++ b/gpx-rs/engine/src/engine/command/tools/mod.rs
@@ -1,4 +1,3 @@
-mod append;
 mod clean;
 mod crop;
 mod elevation;
@@ -6,12 +5,11 @@ mod extract;
 mod merge;
 mod move_waypoint;
 mod new_waypoint;
-mod replace;
 mod reverse;
+mod splice_trackpoints;
 mod split;
 mod time;
 
-pub use append::*;
 pub use clean::*;
 pub use crop::*;
 pub use elevation::*;
@@ -19,7 +17,7 @@ pub use extract::*;
 pub use merge::*;
 pub use move_waypoint::*;
 pub use new_waypoint::*;
-pub use replace::*;
 pub use reverse::*;
+pub use splice_trackpoints::*;
 pub use split::*;
 pub use time::*;
diff --git a/gpx-rs/engine/src/engine/command/tools/replace.rs b/gpx-rs/engine/src/engine/command/tools/splice_trackpoints.rs
similarity index 65%
rename from gpx-rs/engine/src/engine/command/tools/replace.rs
rename to gpx-rs/engine/src/engine/command/tools/splice_trackpoints.rs
index 430993f22..18207a574 100644
--- a/gpx-rs/engine/src/engine/command/tools/replace.rs
+++ b/gpx-rs/engine/src/engine/command/tools/splice_trackpoints.rs
@@ -1,7 +1,7 @@
 use crate::{Apply, CommandError, State};
 
 #[derive(Debug)]
-pub struct Replace<'a> {
+pub struct SpliceTrackpoints<'a> {
     pub start: u32,
     pub end: u32,
     pub lng: &'a [f64],
@@ -9,9 +9,9 @@ pub struct Replace<'a> {
     pub ele: &'a [f64],
 }
 
-impl Apply for Replace<'_> {
+impl Apply for SpliceTrackpoints<'_> {
     fn apply(self, _state: &mut State) -> Result<(), CommandError> {
         // TODO
-        Err(CommandError::NotImplemented("replace"))
+        Err(CommandError::NotImplemented("splice_trackpoints"))
     }
 }
diff --git a/gpx-rs/wasm/src/lib.rs b/gpx-rs/wasm/src/lib.rs
index 637208f02..bec6f55e2 100644
--- a/gpx-rs/wasm/src/lib.rs
+++ b/gpx-rs/wasm/src/lib.rs
@@ -182,15 +182,10 @@ pub fn reverse() -> bool {
 }
 
 #[wasm_bindgen]
-pub fn append(lng: &[f64], lat: &[f64], ele: &[f64]) -> bool {
-    same_len(lng, lat, ele) && edit(Command::Append(engine::Append { lng, lat, ele }))
-}
-
-#[wasm_bindgen]
-pub fn replace(start: u32, end: u32, lng: &[f64], lat: &[f64], ele: &[f64]) -> bool {
+pub fn splice_trackpoints(start: u32, end: u32, lng: &[f64], lat: &[f64], ele: &[f64]) -> bool {
     start <= end
         && same_len(lng, lat, ele)
-        && edit(Command::Replace(engine::Replace {
+        && edit(Command::SpliceTrackpoints(engine::SpliceTrackpoints {
             start,
             end,
             lng,