diff --git a/cli/cmdlineparser.cpp b/cli/cmdlineparser.cpp
index 8c23737b6..1641a2853 100644
--- a/cli/cmdlineparser.cpp
+++ b/cli/cmdlineparser.cpp
@@ -694,8 +694,14 @@ void CmdLineParser::PrintHelp()
               "                         https://sourceforge.net/projects/cppcheck/files/Articles/\n"
 #endif
               "    -s, --style          Deprecated, use --enable=style\n"
-              "    --std=posix          Code is posix\n"
-              "    --std=c99            Code is C99 standard\n"
+              "    --std=<id>           Environment. The available options are:\n"
+              "                          * posix\n"
+              "                                 Use this if a posix environment is available\n"
+              "                          * c99\n"
+              "                                 Use this if the compiler is C99 compatible\n"
+              "                          * c++11\n"
+              "                                 Use this if the compiler is C++11 compatible.\n"
+              "                                 note: you probably want to also use --std=c99.\n"
               "    --suppress=<spec>    Suppress warnings that match <spec>. The format of\n"
               "                         <spec> is:\n"
               "                         [error id]:[filename]:[line]\n"