diff --git a/driver/iverilog.man.in b/driver/iverilog.man.in
index 1c8c53ef5..2578969da 100644
--- a/driver/iverilog.man.in
+++ b/driver/iverilog.man.in
@@ -4,7 +4,7 @@ iverilog - Icarus Verilog compiler
 
 .SH SYNOPSIS
 .B iverilog
-[\-ESuVv] [\-Bpath] [\-ccmdfile|\-fcmdfile] [\-Dmacro[=defn]]
+[\-EiSuVv] [\-Bpath] [\-ccmdfile|\-fcmdfile] [\-Dmacro[=defn]]
 [\-Pparameter=value] [\-pflag=value] [\-dname]
 [\-g1995\:|\-g2001\:|\-g2005\:|\-g2005-sv\:|\-g2009\:|\-g2012\:|\-g<feature>]
 [\-Iincludedir] [\-mmodule] [\-M[mode=]file] [\-Nfile] [\-ooutputfilename]
@@ -156,6 +156,13 @@ for Verilog include files. The \fB\-I\fP switch may be used many times
 to specify several directories to search, the directories are searched
 in the order they appear on the command line.
 .TP 8
+.B -i
+Ignore missing modules. Normally it is an error if a module instantiation
+refers to an undefined module. This option causes the compiler to skip
+over that instantiation. It will also stop the compiler returning an
+error if there are no top level modules. This allows the compiler to be
+used to check incomplete designs for errors.
+.TP 8
 .B -l\fIfile\fP
 Add the specified file to the list of source files to be compiled,
 but mark it as a library file. All modules contained within that