diff --git a/TODO-RELEASE b/TODO-RELEASE
index cbfda241..716f7133 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -7,3 +7,4 @@
 # If any interfaces have been added since the last public release: c:r:a + 1.
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library        what            description / commit summary line
+libosmocore     struct bssgp_bvc_ctx->is_sgsn   field used available only on libosmocore >1.5.1