Added a clarification when passing files instead of directories as arguments.

diff --git a/finddup.1 b/finddup.1
index 334b586..dbe9641 100644 (file)
--- a/finddup.1
+++ b/finddup.1
@@ -10,7 +10,7 @@ finddup \- Find files common to two directories (or not)
 
 .SH "SYNOPSIS"
 
-\fBfinddup\fP [OPTION]... [DIR1 [[and:|not:]DIR2]]
+\fBfinddup\fP [OPTION]... [DIR-OR-FILE1 [[and:|not:]DIR-OR-FILE2]]
 
 .SH "DESCRIPTION"
 
@@ -21,7 +21,8 @@ one as default.
 With two directories, it prints either the files common to both DIR1
 and DIR2 or, with the `not:' prefix, the ones present in DIR1 and not
 in DIR2. The `and:' prefix is assumed by default and necessary only if
-you have a directory name starting with `not:'.
+you have a directory name starting with `not:'. Files are handled like
+directories containing a single file.
 
 This command compares files by first comparing their sizes, hence goes
 reasonably fast.