diff --git a/First-operation.md b/First-operation.md
index 2f68d30..605e83e 100644
--- a/First-operation.md
+++ b/First-operation.md
@@ -57,7 +57,7 @@ If the window does not appear, check the command prompt window that opened with
 
 ## Launching the mission
 
-Launch DCS World, open the mission editor, and open the mission `retribution_nextturn` that should have been generated in the default mission folder. We suggest always clicking save, even if you don't make any changes to the generated mission file. This avoids certain issues with file format.
+Launch DCS World, open the mission editor, and open the mission `retribution_nextturn.miz` that should have been generated in the default mission folder. We suggest always clicking save, even if you don't make any changes to the generated mission file. This avoids certain issues with file format.
 
 ![Mission browser](https://imgur.com/HrcFa7V.png)