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diff --git a/src/lib/server/xlat_builtin.c b/src/lib/server/xlat_builtin.c
index 2bba80a4baba6bd7124e98628c2c9765da330c51..f4c55a5bcf3e7605f31a5668ddf91b78dc9cf90f 100644 (file)
--- a/src/lib/server/xlat_builtin.c
+++ b/src/lib/server/xlat_builtin.c
@@ -2966,6 +2966,11 @@ static xlat_action_t xlat_func_sub(TALLOC_CTX *ctx, fr_cursor_t *out,
 
 
 /** Return the tag of an attribute reference
+ *
+ * Example (Tunnel-Server-Endpoint:1 = "192.0.2.1"):
+@verbatim
+"%{tag:Tunnel-Server-Endpoint}" == "1"
+@endverbatim
  *
  * @ingroup xlat_functions
  */