diff --git a/src/rdkafka_conf.c b/src/rdkafka_conf.c
index 1f8bbf106..6b3a43f9f 100644
--- a/src/rdkafka_conf.c
+++ b/src/rdkafka_conf.c
@@ -1798,7 +1798,7 @@ static const struct rd_kafka_property rd_kafka_properties[] = {
      "property `compression.codec`. Higher values will result in better "
      "compression at the cost of more CPU usage. Usable range is "
      "algorithm-dependent: [0-9] for gzip; [0-12] for lz4; only 0 for snappy; "
-     "-1 = codec-dependent default compression level.",
+     "[0-22] for zstd; -1 = codec-dependent default compression level.",
      RD_KAFKA_COMPLEVEL_MIN, RD_KAFKA_COMPLEVEL_MAX,
      RD_KAFKA_COMPLEVEL_DEFAULT},
 
diff --git a/src/rdkafka_conf.h b/src/rdkafka_conf.h
index 92e5193eb..18f676667 100644
--- a/src/rdkafka_conf.h
+++ b/src/rdkafka_conf.h
@@ -88,7 +88,7 @@ typedef enum {
         RD_KAFKA_COMPLEVEL_LZ4_MAX    = 12,
         RD_KAFKA_COMPLEVEL_SNAPPY_MAX = 0,
         RD_KAFKA_COMPLEVEL_ZSTD_MAX   = 22,
-        RD_KAFKA_COMPLEVEL_MAX        = 12
+        RD_KAFKA_COMPLEVEL_MAX        = 22
 } rd_kafka_complevel_t;
 
 typedef enum {