diff --git a/RELEASE-NOTES b/RELEASE-NOTES
index fc389935478e8776f4980c2f603681181dfd3232..076e1bfff05d236688f371e5422fb19bf50e5124 100644
--- a/RELEASE-NOTES
+++ b/RELEASE-NOTES
@@ -8,6 +8,9 @@ Curl and libcurl 7.19.0
  Contributors:                 654
 
 This release includes the following changes:
+
+ o curl_off_t gets its size/typedef somewhat differently than before. This _may_
+   cause an ABI change for you. See lib/README.curl_off_t for a full explanation.
  
  o Added CURLINFO_PRIMARY_IP
  o Added CURLOPT_CRLFILE and CURLE_SSL_CRL_BADFILE