1 files changed, 2 insertions, 0 deletions
diff --git a/README.md b/README.md
index d67ff1f..c132110 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,8 @@ Entries in this repository also uses the following non-standard BibTeX fields:
 
 * `designer`: who did the design/editing.
 
+* `oclc`: OCLC Control Number - https://en.wikipedia.org/wiki/OCLC.
+
 ## Testing
 
     sudo apt install make biber pybtex