diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26b5bdb50..6e17a446f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 Changes to Calva.
 
 ## [Unreleased]
+- [Change output/repl window extension to .calva-repl](https://github.com/BetterThanTomorrow/calva/issues/754)
 
 ## [2.0.122] - 2020-08-20
 - Fix: [Can't jack-in when no project file is open](https://github.com/BetterThanTomorrow/calva/issues/734)
diff --git a/package.json b/package.json
index 12ca4557c..fa26722f0 100644
--- a/package.json
+++ b/package.json
@@ -87,7 +87,7 @@
                     ".edn",
                     ".joke",
                     ".boot",
-                    ".repl"
+                    ".calva-repl"
                 ]
             }
         ],
diff --git a/src/config.ts b/src/config.ts
index 62c8a55cf..9b277ddd0 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -1,5 +1,5 @@
 const config = {
-    REPL_FILE_EXT: 'repl'
+    REPL_FILE_EXT: 'calva-repl'
 };
 
 type ReplSessionType = 'clj' | 'cljs';
diff --git a/src/providers/annotations.ts b/src/providers/annotations.ts
index 798d8b060..68c70a104 100644
--- a/src/providers/annotations.ts
+++ b/src/providers/annotations.ts
@@ -146,7 +146,7 @@ function decorateSelection(resultString: string, codeSelection: vscode.Selection
         decoration["hoverMessage"] = status == AnnotationStatus.ERROR ? resultString : hoverMessage;
     }
     // for (let s = 0; s < evalSelectionDecorationTypes.length; s++) {
-    //     setSelectionDecorations(editor, [], s);
+    //     setSelectionDecorations(editor, [], s);.
     // }
     setSelectionDecorations(editor, [], status);
     decorationRanges.push(decoration);