1 files changed, 1 insertions, 1 deletions

diff --git a/src/set/gnunet-service-set.h b/src/set/gnunet-service-set.h
index 982967744..f8a2d88ba 100644
--- a/src/set/gnunet-service-set.h
+++ b/src/set/gnunet-service-set.h
@@ -126,7 +126,7 @@ struct OperationSpecification
  * Signature of functions that create the implementation-specific
  * state for a set supporting a specific operation.
  *
- * @return a set state specific to the supported operation
+ * @return a set state specific to the supported operation, NULL on error
  */
 typedef struct SetState *
 (*CreateImpl) (void);