Clarify the man page description of --max-drift.

git-svn-id: http://scons.tigris.org/svn/scons/trunk@1297 fdb21ef1-2011-0410-befe-b5e4ea1792b1

diff --git a/doc/man/scons.1 b/doc/man/scons.1
index a0f408919d5a15f76c4575af815adedcc746c509..52655bf99727f21c6745b2b8d340713a9cc28d7f 100644 (file)
--- a/doc/man/scons.1
+++ b/doc/man/scons.1
@@ -739,10 +739,15 @@ Ignored for compatibility with non-GNU versions of
 .RI --max-drift= SECONDS
 Set the maximum expected drift in the modification time of files to 
 .IR SECONDS .
-This value determines how old a file must be before its content signature
-is cached. The default value is 2 days, which means a file must have a
-modification time of at least two days ago in order to have its content
-signature cached. A negative value means to never cache the content
+This value determines how long a file must be unmodified
+before its cached content signature
+will be used instead of
+calculating a new content signature (MD5 checksum)
+of the file's contents.
+The default value is 2 days, which means a file must have a
+modification time of at least two days ago in order to have its
+cached content signature used.
+A negative value means to never cache the content
 signature and to ignore the cached value if there already is one. A value
 of 0 means to always cache the signature, no matter how old the file is.