diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 61c2da9..b5cca10 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,6 +10,9 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - name: typos-action
+        uses: crate-ci/typos@v1.18.0
+
       - name: Install Rust stable
         run: |
           set -x
diff --git a/convlog/src/tenhou/log.rs b/convlog/src/tenhou/log.rs
index aac1961..e6447bd 100644
--- a/convlog/src/tenhou/log.rs
+++ b/convlog/src/tenhou/log.rs
@@ -33,7 +33,7 @@ pub enum GameLength {
     Tonpuu = 4,
 }
 
-/// Contains infomation about a kyoku.
+/// Contains information about a kyoku.
 #[derive(Debug, Clone)]
 pub struct Kyoku {
     pub meta: KyokuMeta,
@@ -133,14 +133,14 @@ impl TryFrom<RawLog> for Log {
                 },
             };
 
-            if let Some(ResultItem::Status(status_text)) = log.results.get(0) {
+            if let Some(ResultItem::Status(status_text)) = log.results.first() {
                 if status_text == "和了" {
                     let mut details = vec![];
                     for detail_tuple in log.results[1..].chunks_exact(2) {
                         if let [ResultItem::ScoreDeltas(score_deltas), ResultItem::HoraDetail(who_target_tuple)] =
                             detail_tuple
                         {
-                            let who = if let Some(Value::Number(n)) = who_target_tuple.get(0) {
+                            let who = if let Some(Value::Number(n)) = who_target_tuple.first() {
                                 n.as_u64().unwrap_or(0) as u8
                             } else {
                                 return Err(ParseError::InvalidHoraDetail);
diff --git a/convlog/src/tile.rs b/convlog/src/tile.rs
index a90d518..6a83e32 100644
--- a/convlog/src/tile.rs
+++ b/convlog/src/tile.rs
@@ -250,36 +250,6 @@ impl fmt::Display for InvalidTile {
 
 impl Error for InvalidTile {}
 
-#[cfg(test)]
-mod test {
-    use super::*;
-
-    #[test]
-    fn convert() {
-        "E".parse::<Tile>().unwrap();
-        "5mr".parse::<Tile>().unwrap();
-        "?".parse::<Tile>().unwrap();
-        Tile::try_from(0_u8).unwrap();
-        Tile::try_from(36_u8).unwrap();
-        Tile::try_from(37_u8).unwrap();
-
-        "".parse::<Tile>().unwrap_err();
-        "0s".parse::<Tile>().unwrap_err();
-        "!".parse::<Tile>().unwrap_err();
-        Tile::try_from(38_u8).unwrap_err();
-        Tile::try_from(u8::MAX).unwrap_err();
-    }
-
-    #[test]
-    fn next_prev() {
-        MJAI_PAI_STRINGS.iter().take(37).for_each(|&s| {
-            let tile: Tile = s.parse().unwrap();
-            assert_eq!(tile.prev().next(), tile.deaka());
-            assert_eq!(tile.next().prev(), tile.deaka());
-        });
-    }
-}
-
 /**
  * Added in mjai-reviewer
  */
@@ -336,3 +306,33 @@ pub fn tile_set_eq(a: &[Tile], b: &[Tile], ignore_aka: bool) -> bool {
 
     a_bits == b_bits
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn convert() {
+        "E".parse::<Tile>().unwrap();
+        "5mr".parse::<Tile>().unwrap();
+        "?".parse::<Tile>().unwrap();
+        Tile::try_from(0_u8).unwrap();
+        Tile::try_from(36_u8).unwrap();
+        Tile::try_from(37_u8).unwrap();
+
+        "".parse::<Tile>().unwrap_err();
+        "0s".parse::<Tile>().unwrap_err();
+        "!".parse::<Tile>().unwrap_err();
+        Tile::try_from(38_u8).unwrap_err();
+        Tile::try_from(u8::MAX).unwrap_err();
+    }
+
+    #[test]
+    fn next_prev() {
+        MJAI_PAI_STRINGS.iter().take(37).for_each(|&s| {
+            let tile: Tile = s.parse().unwrap();
+            assert_eq!(tile.prev().next(), tile.deaka());
+            assert_eq!(tile.next().prev(), tile.deaka());
+        });
+    }
+}
diff --git a/mjsoul.adoc b/mjsoul.adoc
index b72cce5..42b28ce 100644
--- a/mjsoul.adoc
+++ b/mjsoul.adoc
@@ -4,7 +4,7 @@
 == Background (back in 2021)
 Downloading logs from mjsoul is more difficult than from tenhou because it requires a login and the log formats are different.
 
-For a long time, the reviewer had been able to retrieve mjsoul logs via https://github.com/Equim-chan/tensoul[tensoul,window=_blank], a tool I wrote to automate the process of login to mjsoul with an account, download of the logs and convertions to tenhou format. I created a dummy account and deployed a tensoul on heroku to provide a more accessible service, then the reviewer could retrieve logs in tenhou format directly by accessing the tensoul instance's API. This was once https://github.com/Equim-chan/mjai-reviewer/blob/b815e32e58414361de5b4af5748cabeb6085e9cb/src/download.rs#L5[hard coded,window=_blank] in akochan-reviewer.
+For a long time, the reviewer had been able to retrieve mjsoul logs via https://github.com/Equim-chan/tensoul[tensoul,window=_blank], a tool I wrote to automate the process of login to mjsoul with an account, download of the logs and conversions to tenhou format. I created a dummy account and deployed a tensoul on heroku to provide a more accessible service, then the reviewer could retrieve logs in tenhou format directly by accessing the tensoul instance's API. This was once https://github.com/Equim-chan/mjai-reviewer/blob/b815e32e58414361de5b4af5748cabeb6085e9cb/src/download.rs#L5[hard coded,window=_blank] in akochan-reviewer.
 
 However, the heroku instance where tensoul is deployed (`\https://tensoul.herokuapp.com`) seems to be banned by mjsoul recently as the login command keeps getting error code 151. Migrating the instance to another region could mitigate the problem, but I have already done it once. Currently both of the two regions heroku provides are banned and I have no choice.