diff --git a/rcore-fs/src/vfs.rs b/rcore-fs/src/vfs.rs
index 62c5ef5..78c7d38 100644
--- a/rcore-fs/src/vfs.rs
+++ b/rcore-fs/src/vfs.rs
@@ -256,6 +256,7 @@ pub enum FsError {
     DeviceError,
     IOCTLError,
     NoDevice,
+    Again, // E_AGAIN, when no data is available, never happens in fs
 }
 
 impl fmt::Display for FsError {