diff --git a/MOcov/mocov_find_files.m b/MOcov/mocov_find_files.m
index 09cf1a0..f6c2e24 100644
--- a/MOcov/mocov_find_files.m
+++ b/MOcov/mocov_find_files.m
@@ -12,7 +12,9 @@
 %                       is used, corresponding to all files.
 %   monitor             Optional progress monitory that supports a
 %                       'notify' method.
-%   exclude_pat         Optional cell array of patterns to exclude.
+%   exclude_pat         Optional cell array of patterns to exclude. Both
+%                       files and directories which match one of these
+%                       patterns will be omitted from the output.
 %
 % Output:
 %   res                 Kx1 cell with names of files in root_dir matching