diff --git a/console/tidy.c b/console/tidy.c
index af76f10..015b211 100644
--- a/console/tidy.c
+++ b/console/tidy.c
@@ -388,6 +388,7 @@ static const CmdOptDesc cmdopt_defs[] =  {
     { CmdOptMisc,      "-version",             TC_OPT_VERSION,  0,             NULL,  "-v" },
     { CmdOptMisc,      "-help",                TC_OPT_HELP,     0,             NULL,  "-h", "-?" },
     { CmdOptMisc,      "-help-config",         TC_OPT_HELPCFG,  0,             NULL },
+    { CmdOptMisc,      "-help-env",            TC_OPT_HELPENV,  0,             NULL },
     { CmdOptMisc,      "-show-config",         TC_OPT_SHOWCFG,  0,             NULL },
     { CmdOptMisc,      "-help-option <%s>",    TC_OPT_HELPOPT,  TC_LABEL_OPT,  NULL },
     { CmdOptMisc,      "-language <%s>",       TC_OPT_LANGUAGE, TC_LABEL_LANG, "language: <%s>" },
diff --git a/include/tidyenum.h b/include/tidyenum.h
index 35b530d..1357bdb 100644
--- a/include/tidyenum.h
+++ b/include/tidyenum.h
@@ -432,6 +432,7 @@ extern "C" {
         FN(TC_OPT_GDOC)                     \
         FN(TC_OPT_HELP)                     \
         FN(TC_OPT_HELPCFG)                  \
+        FN(TC_OPT_HELPENV)                  \
         FN(TC_OPT_HELPOPT)                  \
         FN(TC_OPT_IBM858)                   \
         FN(TC_OPT_INDENT)                   \
diff --git a/localize/translations/tidy.pot b/localize/translations/tidy.pot
index a5b0783..8fce546 100644
--- a/localize/translations/tidy.pot
+++ b/localize/translations/tidy.pot
@@ -5,7 +5,7 @@ msgstr ""
 "Plural-Forms: nplurals=2; plural=n != 1;\n"
 "X-Generator: HTML Tidy poconvert.rb\n"
 "Project-Id-Version: \n"
-"POT-Creation-Date: 2017-10-01 18:57:47\n"
+"POT-Creation-Date: 2017-10-01 19:19:32\n"
 "Last-Translator: jderry\n"
 "Language-Team: \n"
 
@@ -3141,6 +3141,10 @@ msgctxt "TC_OPT_HELPCFG"
 msgid "list all configuration options"
 msgstr ""
 
+msgctxt "TC_OPT_HELPENV"
+msgid "show information about the environment and runtime configuration"
+msgstr ""
+
 msgctxt "TC_OPT_HELPOPT"
 msgid "show a description of the <option>"
 msgstr ""
diff --git a/man/tidy1.xsl.in b/man/tidy1.xsl.in
index cb349f3..5396339 100644
--- a/man/tidy1.xsl.in
+++ b/man/tidy1.xsl.in
@@ -160,6 +160,11 @@ since you will probably invoke \fBtidy\fR from different directories.
 The value of HTML_TIDY will be parsed after the compiled-in default
 (defined with -DTIDY_CONFIG_FILE), but before any of the files specified
 using \fB-config\fR.
+.TP
+.B RUNTIME CONFIGURATION FILES
+In general, Unix-like systems support runtime configuration files. Use
+\fBtidy -help-env\fR to see if your version of \fBtidy\fR supports them, and
+where they are expected to be on your system.
 .SH "EXIT STATUS"
 .IP 0
 All input files were processed successfully.
diff --git a/src/language_en.h b/src/language_en.h
index 7581a5d..52c04f7 100644
--- a/src/language_en.h
+++ b/src/language_en.h
@@ -2108,6 +2108,7 @@ static languageDefinition language_en = { whichPluralForm_en, {
     { TC_OPT_GDOC,                  0,   "produce clean version of html exported by Google Docs"                   },
     { TC_OPT_HELP,                  0,   "list the command line options"                                           },
     { TC_OPT_HELPCFG,               0,   "list all configuration options"                                          },
+    { TC_OPT_HELPENV,               0,   "show information about the environment and runtime configuration"        },
     { TC_OPT_HELPOPT,               0,   "show a description of the <option>"                                      },
     { TC_OPT_IBM858,                0,   "use IBM-858 (CP850+Euro) for input, US-ASCII for output"                 },
     { TC_OPT_INDENT,                0,   "indent element content"                                                  },