diff --git a/README.md b/README.md
index 62b652e..ce7403e 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ Usage: dust -n 30  <dir>  (Shows 30 directories not 20)
 Usage: dust -d 3  <dir>  (Shows 3 levels of subdirectories)
 Usage: dust -r  <dir>  (Reverse order of output, with root at the lowest)
 Usage: dust -x  <dir>  (Only show directories on same filesystem)
-Usage: dust -X ignore  <dir>  (Ignore all files and directories containing the string 'ignore')
+Usage: dust -X ignore  <dir>  (Ignore all files and directories with the name 'ignore')
 ```
 
 ```
diff --git a/src/main.rs b/src/main.rs
index aec5656..583fdd8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -62,7 +62,7 @@ fn main() {
                 .takes_value(true)
                 .number_of_values(1)
                 .multiple(true)
-                .help("Exclude any file or directory with contains this substring."),
+                .help("Exclude any file or directory with this name."),
         )
         .arg(
             Arg::with_name("limit_filesystem")