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

1 files changed, 9 insertions, 4 deletions

diff --git a/doc/man/scons.1 b/doc/man/scons.1
index a0f4089..52655bf 100644
--- 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.