diff --git a/.github/actions/spell-check/expect.txt b/.github/actions/spell-check/expect.txt
index e80981840c32..e50bf8aa1fea 100644
--- a/.github/actions/spell-check/expect.txt
+++ b/.github/actions/spell-check/expect.txt
@@ -644,6 +644,7 @@ imageresizerinput
 imageresizersettings
 imagingdevices
 ime
+Indo
 inetcpl
 Infobar
 INFOEXAMPLE
diff --git a/src/modules/poweraccent/PowerAccent.Core/Languages.cs b/src/modules/poweraccent/PowerAccent.Core/Languages.cs
index 2838fe958890..6647221b603c 100644
--- a/src/modules/poweraccent/PowerAccent.Core/Languages.cs
+++ b/src/modules/poweraccent/PowerAccent.Core/Languages.cs
@@ -39,6 +39,7 @@ public enum Language
         NL,
         NO,
         PI,
+        PIE,
         PL,
         PT,
         RO,
@@ -100,6 +101,7 @@ public static string[] GetDefaultLetterKey(LetterKey letter, Language[] langs)
                     Language.NL => GetDefaultLetterKeyNL(letter), // Dutch
                     Language.NO => GetDefaultLetterKeyNO(letter), // Norwegian
                     Language.PI => GetDefaultLetterKeyPI(letter), // Pinyin
+                    Language.PIE => GetDefaultLetterKeyPIE(letter), // Proto-Indo-European
                     Language.PL => GetDefaultLetterKeyPL(letter), // Polish
                     Language.PT => GetDefaultLetterKeyPT(letter), // Portuguese
                     Language.RO => GetDefaultLetterKeyRO(letter), // Romanian
@@ -155,6 +157,7 @@ private static string[] GetDefaultLetterKeyALL(LetterKey letter)
                 .Union(GetDefaultLetterKeyNL(letter))
                 .Union(GetDefaultLetterKeyNO(letter))
                 .Union(GetDefaultLetterKeyPI(letter))
+                .Union(GetDefaultLetterKeyPIE(letter))
                 .Union(GetDefaultLetterKeyPL(letter))
                 .Union(GetDefaultLetterKeyPT(letter))
                 .Union(GetDefaultLetterKeyRO(letter))
@@ -463,6 +466,24 @@ private static string[] GetDefaultLetterKeyPI(LetterKey letter)
             };
         }
 
+        // Proto-Indo-European
+        private static string[] GetDefaultLetterKeyPIE(LetterKey letter)
+        {
+            return letter switch
+            {
+                LetterKey.VK_A => new[] { "ā" },
+                LetterKey.VK_E => new[] { "ē" },
+                LetterKey.VK_O => new[] { "ō" },
+                LetterKey.VK_K => new[] { "ḱ" },
+                LetterKey.VK_G => new[] { "ǵ" },
+                LetterKey.VK_R => new[] { "r̥" },
+                LetterKey.VK_L => new[] { "l̥" },
+                LetterKey.VK_M => new[] { "m̥" },
+                LetterKey.VK_N => new[] { "n̥" },
+                _ => Array.Empty<string>(),
+            };
+        }
+
         // Turkish
         private static string[] GetDefaultLetterKeyTK(LetterKey letter)
         {
diff --git a/src/settings-ui/Settings.UI/Strings/en-us/Resources.resw b/src/settings-ui/Settings.UI/Strings/en-us/Resources.resw
index 7f3b5fdabab7..789a94f004f3 100644
--- a/src/settings-ui/Settings.UI/Strings/en-us/Resources.resw
+++ b/src/settings-ui/Settings.UI/Strings/en-us/Resources.resw
@@ -3672,6 +3672,9 @@ Activate by holding the key for the character you want to add an accent to, then
   <data name="QuickAccent_SelectedLanguage_Pinyin" xml:space="preserve">
     <value>Pinyin</value>
   </data>
+  <data name="QuickAccent_SelectedLanguage_Proto_Indo_European" xml:space="preserve">
+    <value>Proto Indo European</value>
+  </data>
   <data name="QuickAccent_SelectedLanguage_Polish" xml:space="preserve">
     <value>Polish</value>
   </data>
diff --git a/src/settings-ui/Settings.UI/ViewModels/PowerAccentViewModel.cs b/src/settings-ui/Settings.UI/ViewModels/PowerAccentViewModel.cs
index 0c4f9db65092..7da5c4ecfbbf 100644
--- a/src/settings-ui/Settings.UI/ViewModels/PowerAccentViewModel.cs
+++ b/src/settings-ui/Settings.UI/ViewModels/PowerAccentViewModel.cs
@@ -55,6 +55,7 @@ public class PowerAccentViewModel : Observable
             new PowerAccentLanguageModel("MI", "QuickAccent_SelectedLanguage_Maori", LanguageGroup),
             new PowerAccentLanguageModel("NO", "QuickAccent_SelectedLanguage_Norwegian", LanguageGroup),
             new PowerAccentLanguageModel("PI", "QuickAccent_SelectedLanguage_Pinyin", LanguageGroup),
+            new PowerAccentLanguageModel("PIE", "QuickAccent_SelectedLanguage_Proto_Indo_European", LanguageGroup),
             new PowerAccentLanguageModel("PL", "QuickAccent_SelectedLanguage_Polish", LanguageGroup),
             new PowerAccentLanguageModel("PT", "QuickAccent_SelectedLanguage_Portuguese", LanguageGroup),
             new PowerAccentLanguageModel("RO", "QuickAccent_SelectedLanguage_Romanian", LanguageGroup),