diff --git a/src/modules/scanForTimetableChanges.ts b/src/modules/scanForTimetableChanges.ts
index 3c27730..bd9520b 100644
--- a/src/modules/scanForTimetableChanges.ts
+++ b/src/modules/scanForTimetableChanges.ts
@@ -6,9 +6,12 @@ const { bot, defaultEmbedColor, untis, db, sendEmbed } = main;
 export  async function run() {
     let timetable = await untis.getOwnTimetableForRange(new Date(Date.now() - 86400000), new Date(Date.now() + (86400000 * 7)), true);
 
+    let sentClasses = {};
+
     timetable.forEach(lesson => {
         let kLesson = db.knownLessons.get(`${lesson.id}`);
         if (kLesson && hasChanged(lesson, kLesson)) {
+            if (sentClasses['' + (lesson.sg || lesson.su?.[0]?.id) + ' -- ' + lesson.date]) return;
             let dateInfo = {
                 year: Number(`${lesson.date}`.substr(0, 4)),
                 month: Number(`${lesson.date}`.substr(4, 2)),
@@ -24,7 +27,7 @@ export  async function run() {
             let embed = new Discord.MessageEmbed()
                 .setTitle(`Lesson updated`)
                 .setColor(defaultEmbedColor)
-                .setAuthor(`${weekDay}: ${lesson.sg || '(Unnamed lesson)'} - ${lesson.te[0].longname || 'No teacher'}`);
+                .setAuthor(`${weekDay}, ${date.getDate()}. ${date.getMonth() + 1}.: ${lesson.sg || '(Unnamed lesson)'} - ${lesson.te[0].longname || 'No teacher'}`);
             
             let desc = ``;
 
@@ -35,23 +38,43 @@ export  async function run() {
                 ro: 'Room'
             }
             for (const prop of ['kl', 'te', 'su', 'ro']) {
-                if (lesson[prop] != kLesson[prop]) {
-                    desc += `**${propFullName[prop]}:** ${kLesson[prop]?.[0]?.longname} ${kLesson[prop]?.[0]?.longname != kLesson[prop]?.[0]?.name ? `(${(kLesson[prop]?.[0]?.name)})` : ''} \u200b **=>** \u200b ${lesson[prop]?.[0]?.longname} ${lesson[prop]?.[0]?.longname != lesson[prop]?.[0]?.name ? `(${lesson[prop]?.[0]?.name})` : ''} \n`;
+                let lessonStr = JSON.stringify(lesson[prop]);
+                let kLessonStr = JSON.stringify(kLesson[prop]);
+
+                let addProp = (prop) => {
+                    let str = ``;
+                    if ((!prop.name && !prop.longname) || prop.name == '---') str += `None`;
+                    else if (prop.longname) {
+                        str += `${prop.longname} `;
+                        if (prop.name && prop.name != prop.longname) str += `(${prop.name}) `;
+                    } else str += prop.name;
+                    return str;
+                }
+
+                if (lessonStr != kLessonStr) {
+                    desc += '**' + propFullName[prop] + '**: ' + (addProp(kLesson[prop][0]) || 'None') + ' → ' + (addProp(lesson[prop][0] || 'None')) + '\n';
                 }
             }
             if (lesson.activityType != kLesson.activityType) {
-                desc += `**Type:** ${kLesson.activityType} \u200b **=>** \u200b ${lesson.activityType} \n`
+                desc += `**Type:** ${kLesson.activityType} \u200b → \u200b ${lesson.activityType} \n`
             }
 
             if (lesson.substText)
                 desc += `\nℹ️ ${lesson.substText}`;
             
             if (lesson.info)
-                desc += `\nℹ️ ${lesson.info}`
+                desc += `\nℹ️ ${lesson.info}`;
             
+            //if (lesson.code) embed.setColor(lesson.code == 'irregular' ? 'A781B4' : 'B1B3B4');
+            // Change the embed color when teacher ID is 0.
+            // Teacher ID 0 means that the class is canelled (at least on my school),
+            // although I don't know if this is always the case.
+            if (lesson.code == 'irregular' || lesson.te[0].id == 0) embed.setColor('A781B4');
+
             embed.setDescription(desc);
-            console.log(`Sent timetable update`);
+            sentClasses['' + (lesson.sg || lesson.su?.[0]?.id) + ' -- ' + lesson.date] = true;
             sendEmbed(embed);
+            console.log(`Sent timetable update`);
             db.knownLessons.set(`${lesson.id}`, lesson);
         }
         else db.knownLessons.set(`${lesson.id}`, lesson);
diff --git a/tsconfig.json b/tsconfig.json
index 2c568cf..b969bd7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,11 +10,11 @@
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
     // "checkJs": true,                       /* Report errors in .js files. */
     // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
-    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
-    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
-    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    "declaration": true,                      /* Generates corresponding '.d.ts' file. */
+    "declarationMap": true,                   /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    "sourceMap": true,                        /* Generates corresponding '.map' file. */
     // "outFile": "./",                       /* Concatenate and emit output to single file. */
-    "outDir": "./dist",                        /* Redirect output structure to the directory. */
+    "outDir": "./dist",                       /* Redirect output structure to the directory. */
     // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
     // "composite": true,                     /* Enable project compilation */
     // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */