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-rw-r--r--docs/curl.14
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/curl.1 b/docs/curl.1
index c0a76d9d0..9748d5bec 100644
--- a/docs/curl.1
+++ b/docs/curl.1
@@ -1482,8 +1482,10 @@ default statistics.
.I ~/.curlrc
.RS
Default config file, see \fI-K/--config\fP for details.
-
.SH ENVIRONMENT
+The environment variables can be specified in lower case or upper case. The
+lower case version has precedence. http_proxy is an exception as it is only
+available in lower case.
.IP "http_proxy [protocol://]<host>[:port]"
Sets the proxy server to use for HTTP.
.IP "HTTPS_PROXY [protocol://]<host>[:port]"