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-rw-r--r--ppapi/c/dev/ppb_file_ref_dev.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/ppapi/c/dev/ppb_file_ref_dev.h b/ppapi/c/dev/ppb_file_ref_dev.h
index 4799b34..24cb21d 100644
--- a/ppapi/c/dev/ppb_file_ref_dev.h
+++ b/ppapi/c/dev/ppb_file_ref_dev.h
@@ -24,7 +24,8 @@ struct PPB_FileRef_Dev {
// resource is invalid or some type other than a FileRef.
PP_Bool (*IsFileRef)(PP_Resource resource);
- // Returns the file system identifier of this file.
+ // Returns the file system identifier of this file, or
+ // PP_FILESYSTEMTYPE_INVALID if the file ref is invalid.
PP_FileSystemType_Dev (*GetFileSystemType)(PP_Resource file_ref);
// Returns the name of the file. The value returned by this function does not