diff --git a/app/src/main/java/it/danieleverducci/lunatracker/MainActivity.kt b/app/src/main/java/it/danieleverducci/lunatracker/MainActivity.kt
index d8f4efc..cae0f34 100644
--- a/app/src/main/java/it/danieleverducci/lunatracker/MainActivity.kt
+++ b/app/src/main/java/it/danieleverducci/lunatracker/MainActivity.kt
@@ -13,6 +13,7 @@ import android.view.ViewGroup
 import android.widget.AdapterView
 import android.widget.ArrayAdapter
 import android.widget.EditText
+import android.widget.LinearLayout
 import android.widget.NumberPicker
 import android.widget.PopupWindow
 import android.widget.Spinner
@@ -57,6 +58,7 @@ class MainActivity : AppCompatActivity() {
     lateinit var buttonsContainer: ViewGroup
     lateinit var recyclerView: RecyclerView
     lateinit var handler: Handler
+    var signature = ""
     var savingEvent = false
     val updateListRunnable: Runnable = Runnable {
         if (logbook != null && !pauseLogbookUpdate)
@@ -168,6 +170,8 @@ class MainActivity : AppCompatActivity() {
             logbookRepo = FileLogbookRepository()
         }
 
+        signature = settingsRepository.loadSignature()
+
         val noBreastfeeding = settingsRepository.loadNoBreastfeeding()
         findViewById<View>(R.id.layout_nipples).visibility = when (noBreastfeeding) {
             true -> View.GONE
@@ -386,6 +390,14 @@ class MainActivity : AppCompatActivity() {
             pauseLogbookUpdate = false
         })
 
+        // show optional signature
+        dialogView.findViewById<TextView>(R.id.dialog_event_detail_type_signature).text = event.signature
+        dialogView.findViewById<LinearLayout>(R.id.dialog_event_signature_layout).visibility = if (event.signature.isNotEmpty()) {
+            View.VISIBLE
+        } else {
+            View.GONE
+        }
+
         // create next/previous links to events of the same type
 
         val previousTextView = dialogView.findViewById<TextView>(R.id.dialog_event_previous)
@@ -635,6 +647,8 @@ class MainActivity : AppCompatActivity() {
     fun logEvent(event: LunaEvent) {
         savingEvent(true)
 
+        event.signature = signature
+
         setLoading(true)
         logbook?.logs?.add(0, event)
         recyclerView.adapter?.notifyItemInserted(0)
diff --git a/app/src/main/java/it/danieleverducci/lunatracker/SettingsActivity.kt b/app/src/main/java/it/danieleverducci/lunatracker/SettingsActivity.kt
index 7d03b4e..8006986 100644
--- a/app/src/main/java/it/danieleverducci/lunatracker/SettingsActivity.kt
+++ b/app/src/main/java/it/danieleverducci/lunatracker/SettingsActivity.kt
@@ -2,6 +2,7 @@ package it.danieleverducci.lunatracker
 
 import android.os.Bundle
 import android.view.View
+import android.widget.EditText
 import android.widget.RadioButton
 import android.widget.TextView
 import android.widget.Toast
@@ -24,6 +25,7 @@ open class SettingsActivity : AppCompatActivity() {
     protected lateinit var textViewWebDAVPass: TextView
     protected lateinit var progressIndicator: LinearProgressIndicator
     protected lateinit var switchNoBreastfeeding: SwitchMaterial
+    protected lateinit var textViewSignature: EditText
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -36,6 +38,7 @@ open class SettingsActivity : AppCompatActivity() {
         textViewWebDAVPass = findViewById(R.id.settings_data_webdav_pass)
         progressIndicator = findViewById(R.id.progress_indicator)
         switchNoBreastfeeding = findViewById(R.id.switch_no_breastfeeding)
+        textViewSignature = findViewById(R.id.settings_signature)
 
         findViewById<View>(R.id.settings_save).setOnClickListener({
             validateAndSave()
@@ -52,12 +55,14 @@ open class SettingsActivity : AppCompatActivity() {
         val dataRepo = settingsRepository.loadDataRepository()
         val webDavCredentials = settingsRepository.loadWebdavCredentials()
         val noBreastfeeding = settingsRepository.loadNoBreastfeeding()
+        val signature = settingsRepository.loadSignature()
 
         when (dataRepo) {
             LocalSettingsRepository.DATA_REPO.LOCAL_FILE -> radioDataLocal.isChecked = true
             LocalSettingsRepository.DATA_REPO.WEBDAV -> radioDataWebDAV.isChecked = true
         }
 
+        textViewSignature.setText(signature)
         switchNoBreastfeeding.isChecked = noBreastfeeding
 
         if (webDavCredentials != null) {
@@ -156,6 +161,7 @@ open class SettingsActivity : AppCompatActivity() {
             else LocalSettingsRepository.DATA_REPO.LOCAL_FILE
         )
         settingsRepository.saveNoBreastfeeding(switchNoBreastfeeding.isChecked)
+        settingsRepository.saveSignature(textViewSignature.text.toString())
         settingsRepository.saveWebdavCredentials(
             textViewWebDAVUrl.text.toString(),
             textViewWebDAVUser.text.toString(),
diff --git a/app/src/main/java/it/danieleverducci/lunatracker/entities/LunaEvent.kt b/app/src/main/java/it/danieleverducci/lunatracker/entities/LunaEvent.kt
index f00f64a..e46ab25 100644
--- a/app/src/main/java/it/danieleverducci/lunatracker/entities/LunaEvent.kt
+++ b/app/src/main/java/it/danieleverducci/lunatracker/entities/LunaEvent.kt
@@ -55,6 +55,12 @@ class LunaEvent: Comparable<LunaEvent> {
         set(value) {
             jo.put("notes", value)
         }
+    var signature: String
+        get(): String = jo.optString("signature")
+        set(value) {
+            if (value.isNotEmpty())
+                jo.put("signature", value)
+        }
 
     constructor(jo: JSONObject) {
         this.jo = jo
diff --git a/app/src/main/java/it/danieleverducci/lunatracker/repository/LocalSettingsRepository.kt b/app/src/main/java/it/danieleverducci/lunatracker/repository/LocalSettingsRepository.kt
index 577d8f5..1462820 100644
--- a/app/src/main/java/it/danieleverducci/lunatracker/repository/LocalSettingsRepository.kt
+++ b/app/src/main/java/it/danieleverducci/lunatracker/repository/LocalSettingsRepository.kt
@@ -14,6 +14,7 @@ class LocalSettingsRepository(val context: Context) {
         const val SHARED_PREFS_DAV_USER = "webdav_user"
         const val SHARED_PREFS_DAV_PASS = "webdav_password"
         const val SHARED_PREFS_NO_BREASTFEEDING = "no_breastfeeding"
+        const val SHARED_PREFS_SIGNATURE = "signature"
     }
     enum class DATA_REPO {LOCAL_FILE, WEBDAV}
     val sharedPreferences: SharedPreferences
@@ -30,6 +31,14 @@ class LocalSettingsRepository(val context: Context) {
         return sharedPreferences.getInt(SHARED_PREFS_BB_CONTENT, 1)
     }
 
+    fun saveSignature(content: String) {
+        sharedPreferences.edit { putString(SHARED_PREFS_SIGNATURE, content) }
+    }
+
+    fun loadSignature(): String {
+        return sharedPreferences.getString(SHARED_PREFS_SIGNATURE, "") ?: ""
+    }
+
     fun saveNoBreastfeeding(content: Boolean) {
         sharedPreferences.edit { putBoolean(SHARED_PREFS_NO_BREASTFEEDING, content) }
     }
diff --git a/app/src/main/res/layout/activity_settings.xml b/app/src/main/res/layout/activity_settings.xml
index a4cfb2d..4e84cbb 100644
--- a/app/src/main/res/layout/activity_settings.xml
+++ b/app/src/main/res/layout/activity_settings.xml
@@ -119,6 +119,28 @@
                 android:visibility="invisible"/>
         </RadioGroup>
 
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textStyle="bold"
+            android:text="@string/settings_signature" />
+
+        <EditText
+            android:id="@+id/settings_signature"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="20dp"
+            android:layout_marginTop="20dp"
+            android:inputType="textEmailAddress"
+            android:background="@drawable/textview_background"/>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="30dp"
+            android:layout_marginTop="5dp"
+            android:text="@string/settings_signature_desc"/>
+
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
diff --git a/app/src/main/res/layout/dialog_event_detail.xml b/app/src/main/res/layout/dialog_event_detail.xml
index ead5f81..17c5c7e 100644
--- a/app/src/main/res/layout/dialog_event_detail.xml
+++ b/app/src/main/res/layout/dialog_event_detail.xml
@@ -89,4 +89,25 @@
 
     </LinearLayout>
 
+    <LinearLayout
+        android:id="@+id/dialog_event_signature_layout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginEnd="5dp"
+            android:text="@string/dialog_event_detail_signature"/>
+
+        <TextView
+            android:id="@+id/dialog_event_detail_type_signature"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="end"
+            android:text="" />
+
+    </LinearLayout>
+
 </LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 9240807..e422478 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -78,6 +78,8 @@
     <string name="no_connection_retry">Retry</string>
 
     <string name="settings_title">Settings</string>
+    <string name="settings_signature">Signature</string>
+    <string name="settings_signature_desc">Attach a signature to each event you create and for others to see. Useful if multiple people add events.</string>
     <string name="settings_storage">Choose where to save data</string>
     <string name="settings_storage_local">On device</string>
     <string name="settings_storage_local_desc">Most privacy-friendly solution: data doesn\'t leave your device</string>
@@ -129,6 +131,7 @@
     <string name="dialog_event_detail_delete_button">Delete</string>
     <string name="dialog_event_detail_quantity">Quantity</string>
     <string name="dialog_event_detail_notes">Notes</string>
+    <string name="dialog_event_detail_signature">Created By</string>
 
     <string name="dialog_add_logbook_title">Add logbook</string>
     <string name="dialog_add_logbook_logbookname">👶 Logbook name</string>