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-rw-r--r--lib/flowspec.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/flowspec.c b/lib/flowspec.c
index 14b42b52..df5c8da3 100644
--- a/lib/flowspec.c
+++ b/lib/flowspec.c
@@ -815,8 +815,8 @@ flow_builder_add_op_val(struct flow_builder *fb, byte op, u32 value)
* @mask: bitmask
*
* It is required to set appropriate flowspec component type using function
- * flow_builder_set_type(). This function should return 1 for successful adding,
- * otherwise returns 0.
+ * flow_builder_set_type(). Note that for negation, value must be zero or equal
+ * to bitmask.
*/
int
flow_builder_add_val_mask(struct flow_builder *fb, byte op, u32 value, u32 mask)