diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 5ac8211dc4..bb134e0177 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lock.c,v 1.83 2001/02/22 23:20:06 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lock.c,v 1.84 2001/02/23 18:28:46 momjian Exp $
  *
  * NOTES
  *	  Outside modules can create a lock table and acquire/release
@@ -1411,8 +1411,7 @@ LockShmemSize(int maxBackends)
 
 	size += MAXALIGN(sizeof(PROC_HDR)); /* ProcGlobal */
 	size += MAXALIGN(maxBackends * sizeof(PROC));		/* each MyProc */
-	size += MAXALIGN(maxBackends * sizeof(LOCKMETHODCTL));		/* each
-																 * lockMethodTable->ctl */
+	size += MAXALIGN(MAX_LOCK_METHODS * sizeof(LOCKMETHODCTL));	/* each lockMethodTable->ctl */
 
 	/* lockHash table */
 	size += hash_estimate_size(NLOCKENTS(maxBackends),
diff --git a/src/include/storage/lock.h b/src/include/storage/lock.h
index 9c71366d71..653ca9936a 100644
--- a/src/include/storage/lock.h
+++ b/src/include/storage/lock.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: lock.h,v 1.45 2001/02/22 23:02:33 momjian Exp $
+ * $Id: lock.h,v 1.46 2001/02/23 18:28:46 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -79,7 +79,8 @@ typedef int LOCKMETHOD;
 
 /*
  * This is the control structure for a lock table.	It
- * lives in shared memory:
+ * lives in shared memory.  This information is the same
+ * for all backends.
  *
  * lockmethod -- the handle used by the lock table's clients to
  *		refer to the type of lock table being used.
@@ -107,7 +108,7 @@ typedef struct LOCKMETHODCTL
 } LOCKMETHODCTL;
 
 /*
- * Non-shared header for a lock table.
+ * Eack backend has a non-shared lock table header.
  *
  * lockHash -- hash table holding per-locked-object lock information
  * holderHash -- hash table holding per-lock-holder lock information