diff --git a/ctapipe/__main__.py b/ctapipe/__main__.py
index 8103e594ad5..bad62e4aea6 100644
--- a/ctapipe/__main__.py
+++ b/ctapipe/__main__.py
@@ -32,6 +32,10 @@ class MainTool(Application):
             "ctapipe.tools.train_disp_regressor.TrainDispRegressor",
             "Train telescope-type-wise disp regression models for direction reconstruction",
         ),
+        "merge": (
+            "ctapipe.tools.merge.MergeTool",
+            "Merge multiple ctapipe output files into one",
+        ),
         "fileinfo": (
             "ctapipe.tools.fileinfo.FileInfoTool",
             "Obtain metadata and other information from ctapipe output files",