diff --git a/website/docs/os.getenv.md b/website/docs/os.getenv.md
new file mode 100644
index 000000000..37fdd19de
--- /dev/null
+++ b/website/docs/os.getenv.md
@@ -0,0 +1,25 @@
+Gets the value of an environment variable from the host system.
+
+```lua
+id = os.getenv(var)
+```
+
+### Parameters ###
+
+`var` Environment variable name.
+
+### Return Value ###
+
+Returns the value of the environment variable if one is set, or nil.
+
+### Availability ###
+
+Premake 4.0 or later.
+
+### Examples ###
+
+```lua
+if os.getenv('FOO') == "bar" then
+   -- do something specific when FOO=bar
+end
+```
diff --git a/website/docs/os.rename.md b/website/docs/os.rename.md
new file mode 100644
index 000000000..24916c3ce
--- /dev/null
+++ b/website/docs/os.rename.md
@@ -0,0 +1,36 @@
+Rename file system files or directories.
+
+```lua
+os.rename("path", "newpath")
+```
+
+### Parameters ###
+
+`path` is the file system path to be renamed.
+`newpath` is the renamed file system path.
+
+
+### Return Value ###
+
+True if successful, otherwise nil and an error message.
+
+
+### Availability ###
+
+Premake 5.0 or later.
+
+
+### See Also ###
+
+* [os.rmdir](os.rmdir.md)
+* [os.matchfiles](os.matchfiles.md)
+
+
+### Examples ###
+
+```lua
+local ok, err = os.rename{"file.bak", "file.log"}
+if not ok then
+	error(err)
+end
+```
diff --git a/website/sidebars.js b/website/sidebars.js
index b9e819693..289287db9 100644
--- a/website/sidebars.js
+++ b/website/sidebars.js
@@ -383,6 +383,7 @@ module.exports = {
 						'os.findlib',
 						'os.get',
 						'os.getcwd',
+						'os.getenv',
 						'os.getnumcpus',
 						'os.getpass',
 						'os.getversion',
@@ -400,6 +401,7 @@ module.exports = {
 						'os.pathsearch',
 						'os.realpath',
 						'os.remove',
+						'os.rename',
 						'os.rmdir',
 						'os.stat',
 						'os.target',