diff --git a/doc/asn1c-usage.html b/doc/asn1c-usage.html
index 8bd76d6..b16e788 100644
--- a/doc/asn1c-usage.html
+++ b/doc/asn1c-usage.html
@@ -1051,7 +1051,7 @@
 &nbsp;<FONT SIZE="-1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fprintf(stderr,&nbsp;''Specify&nbsp;filename&nbsp;for&nbsp;BER&nbsp;output&#92;n'');</FONT>
 &nbsp;<FONT SIZE="-1">&nbsp;&nbsp;&nbsp;}&nbsp;else&nbsp;{</FONT>
 &nbsp;<FONT SIZE="-1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;const&nbsp;char&nbsp;*filename&nbsp;=&nbsp;av[1];</FONT>
-&nbsp;<FONT SIZE="-1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FILE&nbsp;*fp&nbsp;=&nbsp;fopen(filename,&nbsp;''w'');&nbsp;&nbsp;&nbsp;/*&nbsp;for&nbsp;BER&nbsp;output&nbsp;*/</FONT>
+&nbsp;<FONT SIZE="-1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FILE&nbsp;*fp&nbsp;=&nbsp;fopen(filename,&nbsp;''wb'');&nbsp;&nbsp;&nbsp;/*&nbsp;for&nbsp;BER&nbsp;output&nbsp;*/</FONT>
 &nbsp;
 &nbsp;<FONT SIZE="-1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(!fp)&nbsp;{</FONT>
 &nbsp;<FONT SIZE="-1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;perror(filename);</FONT>
diff --git a/doc/asn1c-usage.lyx b/doc/asn1c-usage.lyx
index f000c89..51445f3 100644
--- a/doc/asn1c-usage.lyx
+++ b/doc/asn1c-usage.lyx
@@ -2296,7 +2296,7 @@
 \begin_inset Quotes sld
 \end_inset 
 
-w
+wb
 \begin_inset Quotes srd
 \end_inset 
 
diff --git a/doc/asn1c-usage.pdf b/doc/asn1c-usage.pdf
index 90168cd..621c1cb 100644
--- a/doc/asn1c-usage.pdf
+++ b/doc/asn1c-usage.pdf
Binary files differ