diff --git a/src/Mod/Path/PathScripts/PathThreadMilling.py b/src/Mod/Path/PathScripts/PathThreadMilling.py
index 1b2edb65b1..4aa45480d4 100644
--- a/src/Mod/Path/PathScripts/PathThreadMilling.py
+++ b/src/Mod/Path/PathScripts/PathThreadMilling.py
@@ -187,7 +187,7 @@ class ObjectThreadMilling(PathCircularHoleBase.ObjectOp):
         obj.addProperty("App::PropertyLength", "MajorDiameter", "Thread", QtCore.QT_TRANSLATE_NOOP("PathThreadMilling", "Set thread's major diameter"))
         obj.addProperty("App::PropertyLength", "MinorDiameter", "Thread", QtCore.QT_TRANSLATE_NOOP("PathThreadMilling", "Set thread's minor diameter"))
         obj.addProperty("App::PropertyLength", "Pitch", "Thread", QtCore.QT_TRANSLATE_NOOP("PathThreadMilling", "Set thread's pitch - used for metric threads"))
-        obj.addProperty("App::PropertyInteger", "TPI", "Thread", QtCore.QT_TRANSLATE_NOOP("PathThreadMilling", "Set thread's tpi - used for imperial threads"))
+        obj.addProperty("App::PropertyInteger", "TPI", "Thread", QtCore.QT_TRANSLATE_NOOP("PathThreadMilling", "Set thread's TPI (turns per inch) - used for imperial threads"))
         obj.addProperty("App::PropertyInteger", "ThreadFit", "Thread", QtCore.QT_TRANSLATE_NOOP("PathThreadMilling", "Set how many passes are used to cut the thread"))
         obj.addProperty("App::PropertyInteger", "Passes", "Operation", QtCore.QT_TRANSLATE_NOOP("PathThreadMilling", "Set how many passes are used to cut the thread"))
         obj.addProperty("App::PropertyEnumeration", "Direction", "Operation", QtCore.QT_TRANSLATE_NOOP("PathThreadMilling", "Direction of thread cutting operation"))