diff --git a/driver/iverilog.man b/driver/iverilog.man
index 97a414a8c..e795ee8f5 100644
--- a/driver/iverilog.man
+++ b/driver/iverilog.man
@@ -1,4 +1,4 @@
-.TH iverilog 1 "May 28th, 2009" "" "Version 0.10.devel"
+.TH iverilog 1 "October 28th, 2009" "" "Version 0.10.devel"
 .SH NAME
 iverilog - Icarus Verilog compiler
 
@@ -436,7 +436,8 @@ integer value.
 .SH "VARIABLES IN COMMAND FILES"
 
 In certain cases, iverilog supports variables in command files. These
-are strings of the form "$(\fIvarname\fP)", where \fIvarname\fP is the
+are strings of the form "$(\fIvarname\fP)" or "${\fIvarname\fP}", where
+\fIvarname\fP is the
 name of the environment variable to read. The entire string is
 replaced with the contents of that variable. Variables are only
 substituted in contexts that explicitly support them, including file
diff --git a/driver/substit.c b/driver/substit.c
index 0b9ef84d5..1c2f1862e 100644
--- a/driver/substit.c
+++ b/driver/substit.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002 Stephen Williams (steve@icarus.com)
+ * Copyright (c) 2002-2009 Stephen Williams (steve@icarus.com)
  *
  *    This source code is free software; you can redistribute it
  *    and/or modify it in source code form under the terms of the GNU
@@ -16,9 +16,6 @@
  *    along with this program; if not, write to the Free Software
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
-#ifdef HAVE_CVS_IDENT
-#ident "$Id: substit.c,v 1.5 2003/12/19 01:27:10 steve Exp $"
-#endif
 
 # include  <string.h>
 # include  <stdlib.h>
@@ -35,13 +32,13 @@ char* substitutions(const char*str)
 
       while (*str) {
 
-	    if ((str[0] == '$') && (str[1] == '(')) {
-		    /* If I find a $(x) string in the source, replace
+	    if ((str[0] == '$') && ((str[1] == '(') || str[1] == '{')) {
+		    /* If I find a $(x) or ${x} string in the source, replace
 		       it in the destination with the contents of the
 		       environment variable x. */
 		  char*name;
 		  char*value;
-		  const char*ep = strchr(str, ')');
+		  const char*ep = strchr(str, (str[1]=='(') ? ')' : '}');
 		  str += 2;
 
 		  name = malloc(ep-str+1);
@@ -92,24 +89,3 @@ char* substitutions(const char*str)
 
       return buf;
 }
-
-
-/*
- * $Log: substit.c,v $
- * Revision 1.5  2003/12/19 01:27:10  steve
- *  Fix various unsigned compare warnings.
- *
- * Revision 1.4  2002/08/12 01:35:01  steve
- *  conditional ident string using autoconfig.
- *
- * Revision 1.3  2002/08/11 23:47:04  steve
- *  Add missing Log and Ident strings.
- *
- * Revision 1.2  2002/06/25 01:33:01  steve
- *  include malloc.h only when available.
- *
- * Revision 1.1  2002/06/23 20:10:51  steve
- *  Variable substitution in command files.
- *
- */
-