diff --git a/CHANGELOG.md b/CHANGELOG.md
index ecbfe2eb..444b6921 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ Thanks to @nate-sys and @jubalh for contributing to this release.
   (#403, #410)
 - Default config updated with better comments, color config for join/part
   messages. (#412)
+- `/join` command errors now print usage help once instead of twice.
 
 # 2023/07/16: 0.11.0
 
diff --git a/crates/libtiny_tui/src/config.rs b/crates/libtiny_tui/src/config.rs
index 9e5d6441..560893fc 100644
--- a/crates/libtiny_tui/src/config.rs
+++ b/crates/libtiny_tui/src/config.rs
@@ -92,6 +92,7 @@ where
     Ok(ChanName::new(name))
 }
 
+// `FromStr` implementation used when parsing channel names in commands (not in config file).
 impl FromStr for Chan {
     type Err = String;
 
@@ -196,10 +197,11 @@ impl From<&Config> for TabConfigs {
 
 #[derive(Debug, Default, Copy, Clone, Deserialize, PartialEq, Eq)]
 pub struct TabConfig {
-    /// `true` if tab is ignoring join/part messages
+    /// Whether the join/part messages are ignored.
     #[serde(default)]
     pub ignore: Option<bool>,
-    /// Notification setting for tab
+
+    /// Notification setting for tab.
     #[serde(default)]
     pub notify: Option<Notifier>,
 }
@@ -226,28 +228,31 @@ impl TabConfig {
     }
 }
 
+// `FromStr` implementation used when parsing channel names in commands (not in config file).
 impl FromStr for TabConfig {
     type Err = String;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
-        let config = s
-            .split('-')
-            .filter_map(|arg| (!arg.is_empty()).then(|| arg.trim()))
-            .try_fold(TabConfig::default(), |mut tc, arg| match arg {
-                // flag
-                "ignore" => {
-                    tc.ignore = Some(true);
-                    Ok(tc)
-                }
-                arg => match arg.split_once(' ') {
-                    // arg with parameter
-                    Some(("notify", val)) => {
-                        tc.notify = Some(Notifier::from_str(val)?);
-                        Ok(tc)
+        let mut config = TabConfig::default();
+        let mut words = s.trim().split(' ').map(str::trim);
+
+        while let Some(word) = words.next() {
+            // `"".split(' ')` yields one empty string.
+            if word.is_empty() {
+                continue;
+            }
+            match word {
+                "-ignore" => config.ignore = Some(true),
+                "-notify" => match words.next() {
+                    Some(notify_setting) => {
+                        config.notify = Some(Notifier::from_str(notify_setting)?)
                     }
-                    _ => Err(format!("Unexpected argument: {:?}", arg)),
+                    None => return Err("-notify parameter missing".to_string()),
                 },
-            })?;
+                other => return Err(format!("Unexpected channel parameter: {:?}", other)),
+            }
+        }
+
         Ok(config)
     }
 }
diff --git a/crates/libtiny_tui/src/key_map.rs b/crates/libtiny_tui/src/key_map.rs
index f5a83e5e..cbca5384 100644
--- a/crates/libtiny_tui/src/key_map.rs
+++ b/crates/libtiny_tui/src/key_map.rs
@@ -103,7 +103,7 @@ impl KeyMap {
     }
 
     pub(crate) fn load(&mut self, key_map: &KeyMap) {
-        self.0.extend(key_map.0.clone().into_iter())
+        self.0.extend(key_map.0.clone())
     }
 }
 
diff --git a/crates/libtiny_tui/src/notifier.rs b/crates/libtiny_tui/src/notifier.rs
index 107ab4a7..b5e359da 100644
--- a/crates/libtiny_tui/src/notifier.rs
+++ b/crates/libtiny_tui/src/notifier.rs
@@ -14,8 +14,10 @@ use serde::Deserialize;
 pub enum Notifier {
     /// Notifications are disabled.
     Off,
+
     /// Generate notifications only for mentions.
     Mentions,
+
     /// Generate notifications for all messages.
     Messages,
 }
diff --git a/crates/libtiny_tui/src/tests/config.rs b/crates/libtiny_tui/src/tests/config.rs
index b9632892..8ebcc39b 100644
--- a/crates/libtiny_tui/src/tests/config.rs
+++ b/crates/libtiny_tui/src/tests/config.rs
@@ -3,6 +3,8 @@ use libtiny_common::{ChanName, ChanNameRef};
 use crate::config::*;
 use crate::notifier::Notifier;
 
+use std::str::FromStr;
+
 #[test]
 fn parsing_tab_configs() {
     let config_str = r##"
@@ -98,3 +100,42 @@ fn parsing_tab_configs() {
         })
     );
 }
+
+#[test]
+fn tab_config_command() {
+    assert_eq!(
+        TabConfig::from_str("").unwrap(),
+        TabConfig {
+            ignore: None,
+            notify: None
+        }
+    );
+    assert_eq!(
+        TabConfig::from_str("-ignore").unwrap(),
+        TabConfig {
+            ignore: Some(true),
+            notify: None
+        }
+    );
+    assert_eq!(
+        TabConfig::from_str("-notify off").unwrap(),
+        TabConfig {
+            ignore: None,
+            notify: Some(Notifier::Off)
+        }
+    );
+    assert_eq!(
+        TabConfig::from_str("-notify off -ignore").unwrap(),
+        TabConfig {
+            ignore: Some(true),
+            notify: Some(Notifier::Off)
+        }
+    );
+    assert_eq!(
+        TabConfig::from_str("-ignore -notify off").unwrap(),
+        TabConfig {
+            ignore: Some(true),
+            notify: Some(Notifier::Off)
+        }
+    );
+}
diff --git a/crates/tiny/src/cmd.rs b/crates/tiny/src/cmd.rs
index 62c51d31..b0011278 100644
--- a/crates/tiny/src/cmd.rs
+++ b/crates/tiny/src/cmd.rs
@@ -321,10 +321,7 @@ fn join(args: CmdArgs) {
         .filter_map(|c| match Chan::from_str(c) {
             Ok(c) => Some(c),
             Err(err) => {
-                ui.add_client_err_msg(
-                    &format!("{}, Usage: {}", err, JOIN_CMD.usage),
-                    &MsgTarget::CurrentTab,
-                );
+                ui.add_client_err_msg(&err, &MsgTarget::CurrentTab);
                 None
             }
         })
@@ -333,12 +330,12 @@ fn join(args: CmdArgs) {
     let chans = if chans.is_empty() {
         match ui.current_tab() {
             None => return,
-            // rejoin current tab's channel
             Some(MsgSource::Chan { serv, chan }) => {
+                // Rejoin current tab's channel.
                 let config = ui.get_tab_config(&serv, Some(chan.as_ref()));
                 vec![Chan::WithConfig { name: chan, config }]
             }
-            Some(_) => {
+            Some(MsgSource::Serv { .. } | MsgSource::User { .. }) => {
                 return ui.add_client_err_msg(
                     &format!("Usage: {}", JOIN_CMD.usage),
                     &MsgTarget::CurrentTab,