diff --git a/Help/command/set.rst b/Help/command/set.rst
index e37e693ccf..dd5ea133be 100644
--- a/Help/command/set.rst
+++ b/Help/command/set.rst
@@ -88,4 +88,10 @@ Set Environment Variable
 
   set(ENV{<variable>} <value>...)
 
-Sets the current process environment ``<variable>`` to the given value.
+Sets an :manual:`Environment Variable <cmake-env-variables(7)>`
+to the given value.
+Subsequent calls of ``$ENV{<variable>}`` will return this new value.
+
+This command affects only the current CMake process, not the process
+from which CMake was called, nor the system environment at large,
+nor the environment of subsequent build or test processes.
diff --git a/Help/command/unset.rst b/Help/command/unset.rst
index 1a5e49f0e1..75210521ec 100644
--- a/Help/command/unset.rst
+++ b/Help/command/unset.rst
@@ -3,6 +3,9 @@ unset
 
 Unset a variable, cache variable, or environment variable.
 
+Unset Normal Variable or Cache Entry
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
 .. code-block:: cmake
 
   unset(<variable> [CACHE | PARENT_SCOPE])
@@ -22,11 +25,17 @@ If ``PARENT_SCOPE`` is present then the variable is removed from the scope
 above the current scope.  See the same option in the :command:`set` command
 for further details.
 
-``<variable>`` can be an environment variable such as:
+Unset Environment Variable
+^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 .. code-block:: cmake
 
-  unset(ENV{LD_LIBRARY_PATH})
+  unset(ENV{<variable>})
 
-in which case the variable will be removed from the current
-environment.
+Removes ``<variable>`` from the currently available
+:manual:`Environment Variables <cmake-env-variables(7)>`.
+Subsequent calls of ``$ENV{<variable>}`` will return the empty string.
+
+This command affects only the current CMake process, not the process
+from which CMake was called, nor the system environment at large,
+nor the environment of subsequent build or test processes.