diff --git a/docs/Environment-Variables.md b/docs/Environment-Variables.md
index 042b68e1c..eaf8b19ab 100644
--- a/docs/Environment-Variables.md
+++ b/docs/Environment-Variables.md
@@ -5,7 +5,6 @@ Users can set environmental variables to override Transmission's default behavio
  * If `TRANSMISSION_HOME` is set, Transmission will look there for its settings instead of in the [[default location|ConfigFiles#Locations]].
  * If `TRANSMISSION_WEB_HOME` is set, Transmission will look there for the [[Web Interface|WebInterface]] files, such as the javascript, html, and graphics files.
  * If `TR_CURL_VERBOSE` is set, debugging information for libcurl will be enabled.  More information about libcurl's debugging mode [is available here](http://curl.haxx.se/libcurl/c/curl_easy_setopt.html#CURLOPTVERBOSE).
- * `TR_DEBUG` (undocumented).
  * If `TR_DEBUG_FD` is set to an integer, that integer is treated as a [file descriptor](http://en.wikipedia.org/wiki/File_descriptor) and very verbose debugging information is written to it.  For example, here is how to turn on debugging and save it to a file named "runlog" when running Transmission from a bash shell:
 
    ```console
@@ -25,4 +24,4 @@ Users can set environmental variables to override Transmission's default behavio
 
 ## Standard Variables Used By Other Tools
 
- * Transmission uses the [libcurl](http://curl.haxx.se/libcurl/) library for http- and https-based tracker announces and scrapes. Transmission doesn't support proxies, but libcurl itself honors [a handful of environment variables](http://curl.haxx.se/libcurl/c/curl_easy_setopt.html#CURLOPTPROXY) to customize _its_ proxy behavior.
\ No newline at end of file
+ * Transmission uses the [libcurl](http://curl.haxx.se/libcurl/) library for http- and https-based tracker announces and scrapes. Transmission doesn't support proxies, but libcurl itself honors [a handful of environment variables](http://curl.haxx.se/libcurl/c/curl_easy_setopt.html#CURLOPTPROXY) to customize _its_ proxy behavior.