diff --git a/cap06.Rmd b/cap06.Rmd
index 3a6e2954be96f7c4e455df767e7ee3cf13baa819..24feaae73352a122f7e24cb8859912874fbf7a5c 100644
--- a/cap06.Rmd
+++ b/cap06.Rmd
@@ -180,7 +180,7 @@ Após as alterações a interface gráfica é chamada.
 git gui
 ```
 
-<!-- ![](./images/gitgui1) -->
+![](./images/git-gui1.png)  
 FIGURA: Inteface `git gui`
 
 A interface `git gui` se apresenta de forma bem simples, o que facilita
@@ -208,6 +208,9 @@ interface para procedimentos não cotidianos.
 
 ### gitk (Tcl/Tk) / gitg (Gtk) / gitx (MacOS) ###
 
+* https://git-scm.com/docs/gitk
+* https://lostechies.com/joshuaflanagan/2010/09/03/use-gitk-to-understand-git/
+
 ### RabbitVCS (Linux/Unix) ###
 
 ### GitHub (MacOS e Windows) ###
diff --git a/images/git-gui1.png b/images/git-gui1.png
new file mode 100644
index 0000000000000000000000000000000000000000..d99a204a2e62511499e9a8019c80cd83f62c2826
Binary files /dev/null and b/images/git-gui1.png differ