diff --git a/examples/debian.yml b/examples/debian.yml
index fa896b3..ccd0404 100644
--- a/examples/debian.yml
+++ b/examples/debian.yml
@@ -16,6 +16,13 @@ systems:
     - --yes
     current_dir: null
     env: {}
+  post_install:
+    - exe: sudo
+      params:
+      - apt
+      - autoremove
+      current_dir: null
+      env: {}
 - name: Rustup
   install:
     exe: rustup
diff --git a/src/command.rs b/src/command.rs
index 84db3db..486b1eb 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -11,6 +11,7 @@ enum UpdateSteps {
     Fetch,
     Compile,
     Install,
+    PostInstall,
 }
 
 #[derive(Debug, Serialize, Deserialize)]
@@ -24,6 +25,7 @@ pub struct System {
     fetch: Option<Cmd>,
     compile: Option<Cmd>,
     install: Cmd,
+    post_install: Option<Vec<Cmd>>,
     // deps or rDeps : Tree
     // exclusive_with : List
 }
@@ -51,6 +53,7 @@ impl From<&str> for UpdateSteps {
             "fetch" => UpdateSteps::Fetch,
             "compile" => UpdateSteps::Compile,
             "install" => UpdateSteps::Install,
+            "post_install" => UpdateSteps::PostInstall,
 
             _ => panic!("Step {} not recognized", value),
         }
@@ -64,6 +67,7 @@ impl From<&String> for UpdateSteps {
             "fetch" => UpdateSteps::Fetch,
             "compile" => UpdateSteps::Compile,
             "install" => UpdateSteps::Install,
+            "post_install" => UpdateSteps::PostInstall,
 
             _ => panic!("Step {} not recognized", value),
         }
@@ -74,10 +78,11 @@ impl Updater {
     fn new() -> Updater {
         let mut up = Updater { systems: vec![] };
         up.systems.push(System {
-            name: "".into(),
+            name: Default::default(),
             fetch: None,
             compile: None,
             install: Cmd::new(),
+            post_install: None,
         });
         up
     }
@@ -117,11 +122,13 @@ impl Updater {
     }
 
     fn update(&self, sys: &System, opt: &Opt) -> Result<()> {
+        // TODO: compute once before calling this function, maybe?
         let steps = if opt.steps.is_empty() {
             vec![
                 UpdateSteps::Fetch,
                 UpdateSteps::Compile,
                 UpdateSteps::Install,
+                UpdateSteps::PostInstall,
             ]
         } else {
             opt.steps.iter().map(|u| u.into()).collect()
@@ -136,6 +143,9 @@ impl Updater {
         if steps.contains(&UpdateSteps::Install) {
             sys.install(opt)?;
         }
+        if steps.contains(&UpdateSteps::PostInstall) {
+            sys.post_install(opt)?;
+        }
 
         Ok(())
     }
@@ -148,6 +158,7 @@ impl System {
             let exit_status = cmd
                 .execute(opt)
                 .map_err(|err| MyError::new(MyErrorKind::Fetch, err, cmd.clone()))?;
+
             if !exit_status.success() {
                 return Err(MyError::new(
                     MyErrorKind::Fetch,
@@ -165,9 +176,10 @@ impl System {
             let exit_status = cmd
                 .execute(opt)
                 .map_err(|err| MyError::new(MyErrorKind::Compile, err, cmd.clone()))?;
+
             if !exit_status.success() {
                 return Err(MyError::new(
-                    MyErrorKind::Fetch,
+                    MyErrorKind::Compile,
                     io::Error::new(io::ErrorKind::Other, format!("{}", exit_status)),
                     cmd.clone(),
                 ));
@@ -181,15 +193,36 @@ impl System {
         let exit_status = cmd
             .execute(opt)
             .map_err(|err| MyError::new(MyErrorKind::Install, err, cmd.clone()))?;
+
         if !exit_status.success() {
             return Err(MyError::new(
-                MyErrorKind::Fetch,
+                MyErrorKind::Install,
                 io::Error::new(io::ErrorKind::Other, format!("{}", exit_status)),
                 cmd.clone(),
             ));
         }
         Ok(())
     }
+
+    pub fn post_install(&self, opt: &Opt) -> Result<()> {
+        if let Some(post_install) = &self.post_install {
+            for cmd in post_install {
+                let cmd = cmd.clone().prepare(opt);
+                let exit_status = cmd
+                    .execute(opt)
+                    .map_err(|err| MyError::new(MyErrorKind::PostInstall, err, cmd.clone()))?;
+
+                if !exit_status.success() {
+                    return Err(MyError::new(
+                        MyErrorKind::PostInstall,
+                        io::Error::new(io::ErrorKind::Other, format!("{}", exit_status)),
+                        cmd.clone(),
+                    ));
+                }
+            }
+        }
+        Ok(())
+    }
 }
 
 impl Cmd {
diff --git a/src/errors.rs b/src/errors.rs
index 6a1b7aa..5537bcf 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -22,9 +22,10 @@ pub struct MyError {
 #[non_exhaustive]
 pub enum MyErrorKind {
     Config,
-    Fetch, // TODO: merge into "Update" or "Command" type of error? => Have this as an other level of error?
-    Compile, // TODO: merge into "Update" or "Command" type of error? => Have this as an other level of error?
-    Install, // TODO: merge into "Update" or "Command" type of error? => Have this as an other level of error?
+    Fetch,
+    Compile,
+    Install,
+    PostInstall,
 }
 
 impl MyError {
@@ -70,6 +71,12 @@ impl Display for MyError {
                 self.cmd,
                 self.source().unwrap()
             ),
+            MyErrorKind::PostInstall => write!(
+                f,
+                "Could not do the post_install command {}: {}",
+                self.cmd,
+                self.source().unwrap()
+            ),
         }
     }
 }