diff --git a/src/libnm-client-impl/libnm.ver b/src/libnm-client-impl/libnm.ver
index 8064432b5a..ab77bdea9a 100644
--- a/src/libnm-client-impl/libnm.ver
+++ b/src/libnm-client-impl/libnm.ver
@@ -1,3 +1,11 @@
+# This is the symbol version script of libnm for the linker.
+#
+# Note that once a stable release is done, all version nodes so
+# far must not change anymore. E.g. after 1.36.0 release, libnm_1_36_0
+# node (and all other version nodes) are frozen.
+#
+# Only add/remove symbols in the section for the current development
+# version, at the bottom of the file.
 libnm_1_0_0 {
 global:
 	nm_802_11_ap_flags_get_type;