diff --git a/cli/src/main.rs b/cli/src/main.rs
index 48d91e32..e7600b30 100644
--- a/cli/src/main.rs
+++ b/cli/src/main.rs
@@ -120,9 +120,9 @@ fn run() -> error::Result<()> {
                         .long("filter")
                         .short("f")
                         .takes_value(true)
-                        .help("Only runs tests that include the string passed as argument."),
+                        .help("Only run corpus test cases whose name includes the given string"),
                 )
-                .arg(Arg::with_name("update").long("update").short("u").help("Update all syntax trees in corpus files with current parser output."))
+                .arg(Arg::with_name("update").long("update").short("u").help("Update all syntax trees in corpus files with current parser output"))
                 .arg(Arg::with_name("debug").long("debug").short("d"))
                 .arg(Arg::with_name("debug-graph").long("debug-graph").short("D")),
         )