diff --git a/list.json b/list.json
index 8fdbc8fb3bb9df7fb48274552da9ddd52ba508f1..34747f851205d8137b27fde4d812f067fb60b6e1 100644
--- a/list.json
+++ b/list.json
@@ -21,17 +21,17 @@
         }
     },
     {
-        "filename": "github_gitlab.md",
+        "filename": "installation.md",
         "attr": {
         }
     },
     {
-        "filename": "installation.md",
+        "filename": "essential_commands.md",
         "attr": {
         }
     },
     {
-        "filename": "essential_commands.md",
+        "filename": "github_gitlab.md",
         "attr": {
         }
     },
diff --git a/thanks.md b/thanks.md
index 9e575cbbe20ec175f5e0e3341f6c36be6c2d9b15..d360c3838438cce197c7864351bb9d4c54ef07b1 100644
--- a/thanks.md
+++ b/thanks.md
@@ -1,3 +1,10 @@
+# References
+
+[1]: **Git** Book: https://git-scm.com/book/en/v2
+
+
+# Acknowledgement
+
 Laurent Heirendt
 
 ![](https://avatars0.githubusercontent.com/u/20812112?v=3&s=180)