diff --git a/Quik.StbTrueType/Stbtt.Manual.cs b/Quik.StbTrueType/Stbtt.Manual.cs
index a0862e8..0232a01 100644
--- a/Quik.StbTrueType/Stbtt.Manual.cs
+++ b/Quik.StbTrueType/Stbtt.Manual.cs
@@ -52,7 +52,8 @@ namespace Quik.Stb
             string f    = file       == null ? string.Empty : Marshal.PtrToStringUTF8((IntPtr)file);
             string func = function   == null ? string.Empty : Marshal.PtrToStringUTF8((IntPtr)function);
 
-            Exception ex = new Exception("Assert failed in native stbtt code.");
+            Exception ex =
+                new Exception($"Assert failed in native stbtt code. ({System.IO.Path.GetFileName(f)}:{line})");
                 ex.Data.Add("Expression", expr);
                 ex.Data.Add("File", f);
                 ex.Data.Add("Line", line);