updated for version 7.0218
diff --git a/runtime/doc/quickfix.txt b/runtime/doc/quickfix.txt
index 5a83700..76e0454 100644
--- a/runtime/doc/quickfix.txt
+++ b/runtime/doc/quickfix.txt
@@ -1,4 +1,4 @@
-*quickfix.txt* For Vim version 7.0aa. Last change: 2006 Mar 07
+*quickfix.txt* For Vim version 7.0aa. Last change: 2006 Mar 08
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -478,8 +478,13 @@
- Uses Vim search patterns. Multi-line patterns can be used.
- When plugins are enabled: compressed and remote files can be searched.
|gzip| |netrw|
-- When 'hidden' is set the files are kept loaded, thus repeating a search is
- much faster. Uses a lot of memory though!
+
+To be able to do this Vim loads each file as if it is being edited. When
+there is no match in the file the assicated buffer is wiped out again. The
+'hidden' option is ignored here to avoid running out of memory or file
+descriptors when searching many files. However, when the |:hide| command
+modifier is used the buffers are kept loaded. This makes following searches
+in the same files a lot faster.
5.1 using Vim's internal grep