diff --git a/speedtest-cli.1 b/speedtest-cli.1
index 367c977..bd7380d 100644
--- a/speedtest-cli.1
+++ b/speedtest-cli.1
@@ -55,7 +55,7 @@ Suppress verbose output, only show basic information
 
 \fB\-\-csv\fR
 .RS
-Suppress verbose output, only show basic information in CSV format. Speeds listed in bit/s and not affected by \-\-bytes
+Suppress verbose output, only show basic information in CSV format. Speeds listed in bit/s and not affected by \-\-bytes. Timestamps do not respect locale settings and give always UTC.
 .RE
 
 \fB\-\-csv\-delimiter CSV_DELIMITER\fR
@@ -70,7 +70,7 @@ Print CSV headers
 
 \fB\-\-json\fR
 .RS
-Suppress verbose output, only show basic information in JSON format. Speeds listed in bit/s and not affected by \-\-bytes
+Suppress verbose output, only show basic information in JSON format. Speeds listed in bit/s and not affected by \-\-bytes. Timestamps do not respect locale settings and give always UTC.
 .RE
 
 \fB\-\-list\fR