diff --git a/src/tags.rs b/src/tags.rs
index 11d46ee..fde69da 100644
--- a/src/tags.rs
+++ b/src/tags.rs
@@ -20,7 +20,6 @@ pub struct Images {
 
 #[derive(Deserialize)]
 pub struct Tags {
-    // count: i32,
     next_page: Option<String>,
     prev_page: Option<String>,
     pub results: Vec<Images>,
@@ -63,6 +62,7 @@ impl Tags {
         Ok(tags)
     }
 
+    /// checks the repo name and may add a prefix for official images
     pub fn check_repo(mut name: String) -> Result<String, Error> {
         //check for right set of characters
         if name.bytes().any(|c| !c.is_ascii()) {
@@ -87,6 +87,7 @@ impl fmt::Display for Images {
     }
 }
 
+/// converts a given duration to a readable string
 fn format_time_nice(time: chrono::Duration) -> String {
     if time.num_weeks() == 52 {
         format!("{} Jahr", (time.num_weeks() / 52) as i32)
diff --git a/src/ui.rs b/src/ui.rs
index 97c0d20..0d042d5 100644
--- a/src/ui.rs
+++ b/src/ui.rs
@@ -179,10 +179,12 @@ impl Ui {
         terminal.clear().unwrap();
     }
 
+    /// helper function to show information in TagList
     fn show_info(&mut self, error: &str) {
         self.tags = tag_list::TagList::with_status(error);
     }
 
+    /// create a thread for catching input and send them to core loop
     pub fn spawn_stdin_channel(&self) -> mpsc::Receiver<termion::event::Key> {
         let (tx, rx) = mpsc::channel::<termion::event::Key>();
 
diff --git a/src/widget/repo_entry.rs b/src/widget/repo_entry.rs
index ed33fa4..844fcde 100644
--- a/src/widget/repo_entry.rs
+++ b/src/widget/repo_entry.rs
@@ -75,6 +75,7 @@ impl RepoEntry {
         }
     }
 
+    /// set the widget to unchanged
     pub fn confirm(&mut self) {
         self.old_text = self.text.clone();
         self.changed = false;
diff --git a/src/widget/service_switcher.rs b/src/widget/service_switcher.rs
index 390979e..5719a04 100644
--- a/src/widget/service_switcher.rs
+++ b/src/widget/service_switcher.rs
@@ -88,6 +88,7 @@ impl ServiceSwitcher {
         (items, &mut self.state)
     }
 
+    /// finds the next image tag in given file
     pub fn find_next_match(&mut self) -> bool {
         let current_line: usize = match self.state.selected() {
             None => 0,
@@ -114,6 +115,7 @@ impl ServiceSwitcher {
         false
     }
 
+    /// finds the previous image tag in given file
     pub fn find_previous_match(&mut self) -> bool {
         let current_line: usize = match self.state.selected() {
             None => 0,
@@ -146,7 +148,7 @@ impl ServiceSwitcher {
         false
     }
 
-    //return the repository from currently selected row
+    /// return the repository from currently selected row
     pub fn extract_repo(&self) -> Result<String, Error> {
         match self.state.selected() {
             None => return Err(Error::NoneSelected),
@@ -161,6 +163,7 @@ impl ServiceSwitcher {
         }
     }
 
+    /// replace currently selected line with repo and tag
     pub fn change_current_line(&mut self, repo_with_tag: String) {
         match self.state.selected() {
             None => (),
@@ -178,6 +181,7 @@ impl ServiceSwitcher {
         self.changed = true;
     }
 
+    /// save the currently opened file
     pub fn save(&mut self) -> Result<(), std::io::Error> {
         let name = "docker-compose.yml";
         let mut file = File::create(name)?;
diff --git a/src/widget/tag_list.rs b/src/widget/tag_list.rs
index 7dc7491..23313ee 100644
--- a/src/widget/tag_list.rs
+++ b/src/widget/tag_list.rs
@@ -26,23 +26,27 @@ impl fmt::Display for Error {
         }
     }
 }
+
+/// used for creating a TagList
 pub enum Type {
     Status(String),
     Repo(tags::Tags),
 }
 
 impl TagList {
-    pub fn new(typ: Type) -> Self {
+    fn new(typ: Type) -> Self {
         Self {
             typ,
             state: ListState::default(),
         }
     }
 
+    /// create a TagList with a status message
     pub fn with_status(status: &str) -> Self {
         Self::new(Type::Status(String::from(status)))
     }
 
+    /// create a TagList
     pub fn with_repo(name: String) -> Self {
         match tags::Tags::new(name) {
             Err(e) => Self::with_status(&format!("{}", e)),
@@ -50,6 +54,7 @@ impl TagList {
         }
     }
 
+    /// get a list of tag names with info
     fn print_lines(&self) -> Vec<String> {
         match &self.typ {
             Type::Status(line) => vec![line.to_string()],
@@ -57,6 +62,7 @@ impl TagList {
         }
     }
 
+    /// get the list of tag names
     pub fn get_names(&self) -> Result<Vec<String>, Error> {
         match &self.typ {
             Type::Status(_) => Err(Error::NoTags),
@@ -64,6 +70,7 @@ impl TagList {
         }
     }
 
+    /// get the selected tag or return an error
     pub fn get_selected(&self) -> Result<String, Error> {
         match &self.typ {
             Type::Status(_) => Err(Error::NoTags),
@@ -121,6 +128,7 @@ impl TagList {
         }
     }
 
+    /// select next tag
     pub fn next(&mut self) {
         match self.state.selected() {
             None if self.print_lines().len() > 0 => self.state.select(Some(0)),
@@ -130,6 +138,7 @@ impl TagList {
         }
     }
 
+    /// select previous tag
     pub fn previous(&mut self) {
         match self.state.selected() {
             None if self.print_lines().len() > 0 => {