diff --git a/docs/guide/environment.rst b/docs/guide/environment.rst
index a8e4b4439..4cfe4c535 100644
--- a/docs/guide/environment.rst
+++ b/docs/guide/environment.rst
@@ -7,6 +7,21 @@ Environment
 This section describes the environment variables used by Verilator and
 associated programs.
 
+.. option:: AR
+
+   Optionally overrides the default :command:`ar` (archive) binary used by
+   the Verilated makefiles. If AR is not set, the version found at
+   configure time is used.
+
+.. option:: CXX
+
+   Optionally overrides the default compiler binary used by the Verilated
+   makefiles. If CXX is not set, the version found at configure time is
+   used.  Note the default flags passed to the compiler are determined at
+   configuration time, so changing the CXX compiler version using this
+   variable, as opposed to passing it at configuration time, may not give
+   desired results.
+
 .. option:: LD_LIBRARY_PATH
 
    A generic Linux/OS variable specifying what directories have shared
@@ -35,6 +50,12 @@ associated programs.
    those programs.  If OBJCACHE is not set, and at configure time ccache
    was present, ccache will be used as a default.
 
+.. option:: PYTHON3
+
+   Optionally overrides the default :command:`python3` binary used by the
+   Verilated makefiles. If PYTHON3 is not set, the version found at
+   configure time is used.
+
 .. option:: SYSTEMC
 
    Deprecated.  Used only if :option:`SYSTEMC_INCLUDE` or
diff --git a/docs/internals.rst b/docs/internals.rst
index 136c90265..d03eebd17 100644
--- a/docs/internals.rst
+++ b/docs/internals.rst
@@ -1400,7 +1400,7 @@ Controlling the Test Driver
 ---------------------------
 
 The test driver script `driver.pl` runs tests; see the `Test Driver`
-section.  The individual test drivers are written in PERL; see `Test
+section.  The individual test drivers are written in Perl; see `Test
 Language`.
 
 
@@ -1432,7 +1432,7 @@ Developers will also want to call ./configure with two extra flags:
    disabled by default, as SystemC installation problems would otherwise
    falsely indicate a Verilator problem.
 
-When enabling the long tests, some additional PERL modules are needed,
+When enabling the long tests, some additional Perl modules are needed,
 which you can install using cpan.
 
 ::
diff --git a/docs/spelling.txt b/docs/spelling.txt
index cddf6a1b2..d55530c50 100644
--- a/docs/spelling.txt
+++ b/docs/spelling.txt
@@ -486,6 +486,7 @@ countbits
 countones
 cout
 cpp
+cppstyle
 cpu
 ctor
 ctrace