diff --git a/lib/async.dart b/lib/async.dart
index 006d33d..99e50cf 100644
--- a/lib/async.dart
+++ b/lib/async.dart
@@ -2,6 +2,5 @@
 library async;
 
 export 'src/exceptions.dart';
-export 'src/file_system_converters.dart';
 export 'src/shell_base.dart' hide $;
 export 'src/shell_async.dart';
diff --git a/lib/src/file_system_converters.dart b/lib/src/file_system_converters.dart
index 6bf2a73..64cd257 100644
--- a/lib/src/file_system_converters.dart
+++ b/lib/src/file_system_converters.dart
@@ -15,7 +15,8 @@ class FileSystemEntityConverter extends Converter<String, FileSystemEntity> {
     } else if (FileSystemEntity.isLinkSync(input)) {
       return Link(input);
     }
-    throw ShellResultConversionException(FileSystemEntity, input);
+    throw ShellResultConversionException(FileSystemEntity, input,
+        addtionalMessage: "The input was not an existing FileSystemEntity.");
   }
 }
 
@@ -30,7 +31,8 @@ class FileConverter extends Converter<String, File> {
     if (file.existsSync()) {
       return file;
     }
-    throw ShellResultConversionException(File, input);
+    throw ShellResultConversionException(File, input,
+        addtionalMessage: "The input was not an existing File.");
   }
 }
 
@@ -45,7 +47,8 @@ class DirectoryConverter extends Converter<String, Directory> {
     if (directory.existsSync()) {
       return directory;
     }
-    throw ShellResultConversionException(Directory, input);
+    throw ShellResultConversionException(Directory, input,
+        addtionalMessage: "The input was not an existing Directory.");
   }
 }
 
@@ -60,6 +63,7 @@ class LinkConverter extends Converter<String, Link> {
     if (link.existsSync()) {
       return link;
     }
-    throw ShellResultConversionException(Link, input);
+    throw ShellResultConversionException(Link, input,
+        addtionalMessage: "The input was not an existing Link.");
   }
 }
diff --git a/lib/sync.dart b/lib/sync.dart
index c3fe766..29add6c 100644
--- a/lib/sync.dart
+++ b/lib/sync.dart
@@ -2,6 +2,5 @@
 library sync;
 
 export 'src/exceptions.dart';
-export 'src/file_system_converters.dart';
 export 'src/shell_base.dart' hide $;
 export 'src/shell_sync.dart';