diff --git a/core/logic/smn_filesystem.cpp b/core/logic/smn_filesystem.cpp
index 63348c47..5165fc64 100644
--- a/core/logic/smn_filesystem.cpp
+++ b/core/logic/smn_filesystem.cpp
@@ -309,7 +309,7 @@ static cell_t sm_OpenDirectory(IPluginContext *pContext, const cell_t *params)
 	
 	if (!path[0])
 	{
-		return pContext->ThrowNativeError("Invalid file path");
+		return pContext->ThrowNativeError("Invalid path. An empty path string is not valid, use \".\" to refer to the current working directory.");
 	}
 	
 	Handle_t handle = 0;