diff --git a/bin/verilator b/bin/verilator
index 29c2d2115..e8178b299 100755
--- a/bin/verilator
+++ b/bin/verilator
@@ -351,7 +351,8 @@ descriptions in the next sections for more information.
      +verilog1995ext+<ext>      Synonym for +1364-1995ext+<ext>
      +verilog2001ext+<ext>      Synonym for +1364-2001ext+<ext>
     --vpi                       Enable VPI compiles
-     -Werror-<message>          Convert warning to error
+     -Wall                      Enable all style warnings
+     -Werror-<message>          Convert warnings to errors
      -Wfuture-<message>         Disable unknown message warnings
      -Wno-<message>             Disable warning
      -Wno-lint                  Disable all lint warnings
@@ -1200,8 +1201,9 @@ Enable use of VPI and linking against the verilated_vpi.cpp files.
 
 =item -Wall
 
-Enable all warnings, including code style warnings that are normally
-disabled by default.
+Enable all code style warnings, including code style warnings that are
+normally disabled by default. Equivelent to "-Wwarn-lint -Wwarn-style".
+Excludes some specialty warnings, i.e. IMPERFECTSCH.
 
 =item -Werror-I<message>
 
@@ -3156,8 +3158,8 @@ correctly.
 
 Warns that the scheduling of the model is not absolutely perfect, and some
 manual code edits may result in faster performance.  This warning defaults
-to off, and must be turned on explicitly before the top module statement is
-processed.
+to off, is not part of -Wall, and must be turned on explicitly before the
+top module statement is processed.
 
 =item IMPLICIT
 
diff --git a/test_regress/t/t_order_clkinst_bad.pl b/test_regress/t/t_order_clkinst_bad.pl
new file mode 100755
index 000000000..caf2f84ba
--- /dev/null
+++ b/test_regress/t/t_order_clkinst_bad.pl
@@ -0,0 +1,21 @@
+#!/usr/bin/perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003-2009 by Wilson Snyder. This program is free software; you can
+# redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+
+top_filename("t/t_order_clkinst.v");
+
+compile (
+    v_flags2 => ["-Wwarn-IMPERFECTSCH"],
+    fails=>1,
+    expect=>
+q{.*%Warning-IMPERFECTSCH: .*
+.*%Error: Exiting due to.*},
+    );
+
+ok(1);
+1;