diff --git a/lib/zclient.c b/lib/zclient.c
index eb8de1a..a32faaa 100644
--- a/lib/zclient.c
+++ b/lib/zclient.c
@@ -530,7 +530,7 @@
   * If ZAPI_MESSAGE_METRIC is set, the metric value is written as an 8
   * byte value.
   *
-  * If ZAPI_MESSAGE_TAG is set, the tag value is written as a 2 byte value
+  * If ZAPI_MESSAGE_TAG is set, the tag value is written as a 4 byte value
   *
   * XXX: No attention paid to alignment.
   */