Maybe "shared_buffers" is a slightly better name than "shmem_buffers" for -B.

doc/src/sgml/runtime.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.20 2000/08/26 19:34:24 petere Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.21 2000/08/28 11:57:40 petere Exp $
 -->
 
 <Chapter Id="runtime">
@@ -964,7 +964,7 @@ env PGOPTIONS='--geqo=off' psql
      </varlistentry>
 
      <varlistentry>
-      <term>SHMEM_BUFFERS (<type>integer</type>)</term>
+      <term>SHARED_BUFFERS (<type>integer</type>)</term>
       <listitem>
        <para>
         Sets the number of shared memory buffers the database server
@@ -1030,7 +1030,7 @@ env PGOPTIONS='--geqo=off' psql
       <tbody>
        <row>
         <entry>-B <replaceable>x</replaceable></entry>
-        <entry>shmem_buffers = <replaceable>x</replaceable></entry>
+        <entry>shared_buffers = <replaceable>x</replaceable></entry>
         <entry></entry>
        </row>
        <row>

src/backend/utils/misc/guc.c

@@ -4,7 +4,7 @@
  * Support for grand unified configuration scheme, including SET
  * command, configuration file, and command line options.
  *
- * $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.9 2000/08/25 10:00:31 petere Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.10 2000/08/28 11:57:41 petere Exp $
  *
  * Copyright 2000 by PostgreSQL Global Development Group
  * Written by Peter Eisentraut <peter_e@gmx.net>.
@@ -231,7 +231,7 @@ ConfigureNamesInt[] =
 	 */
 	{"max_connections",         PGC_POSTMASTER,         &MaxBackends,
 	 DEF_MAXBACKENDS, 1, MAXBACKENDS},
-	{"shmem_buffers",           PGC_POSTMASTER,         &NBuffers,
+	{"shared_buffers",          PGC_POSTMASTER,         &NBuffers,
 	 DEF_NBUFFERS, 16, INT_MAX},
 	{"port",                    PGC_POSTMASTER,         &PostPortName,
 	 DEF_PGPORT, 1, 65535},