diff --git a/.gitattributes b/.gitattributes
index 7a17dfd..70dddb9 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -7,4 +7,5 @@ dot_profile linguist-language=Shell
 dot_gitconfig linguist-language=TOML linguist-detectable
 *.toml linguist-detectable
 *.toml.tmpl linguist-language=TOML linguist-detectable
-*.cfg.tmpl linguist-language=INI linguist-detectable
\ No newline at end of file
+*.cfg.tmpl linguist-language=INI linguist-detectable
+*.age diff=age
\ No newline at end of file
diff --git a/.gitconfig b/.gitconfig
new file mode 100644
index 0000000..9f0e9e0
--- /dev/null
+++ b/.gitconfig
@@ -0,0 +1,2 @@
+[diff "age"]
+  textconv = "age -d -i ~/key.txt"
\ No newline at end of file
diff --git a/home/run_onchange_gitconfig.sh.tmpl b/home/run_onchange_gitconfig.sh.tmpl
new file mode 100644
index 0000000..f0c66b1
--- /dev/null
+++ b/home/run_onchange_gitconfig.sh.tmpl
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# We just need to have access to the Git repository
+cd {{ .chezmoi.sourceDir }}
+# The path is relative to the .git/config file
+git config --local include.path ../.gitconfig