[PATCH] maint: copy: document a member of struct cp_options

[Collin Funk]

* src/copy.h (struct cp_options): Document the src_info member.
---
 src/copy.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/copy.h b/src/copy.h
index 0f3616c21..294cffaaf 100644
--- a/src/copy.h
+++ b/src/copy.h
@@ -298,7 +298,12 @@ struct cp_options
      this feature.  */
   Hash_table *dest_info;
 
-  /* FIXME */
+  /* This is a set of dev/inode pairs.  This allows 'cp' to warn when the
+     same file is given multiple times on the command line. E.g., with
+     invocations like this:
+       rm -rf a b; touch a; mkdir b; cp a a ./a b
+     Use src_info_init to initialize it, or set it to NULL to disable
+     this feature.  */
   Hash_table *src_info;
 };
 
-- 
2.55.0