diff --git a/README.md b/README.md
index 07e8ea3..bd94597 100644
--- a/README.md
+++ b/README.md
@@ -328,7 +328,9 @@ Options:
       --hash-dir <HASH_DIR>
           database hash chunk directory and other files
       --chunk-dir <CHUNK_DIR>
-
+          chunk directory
+      --full-output
+          output file contains all unclassified seq
   -T, --confidence-threshold <CONFIDENCE_THRESHOLD>
           Confidence score threshold, default is 0.0 [default: 0]
   -K, --report-kmer-data
@@ -384,6 +386,8 @@ Options:
           In comb. w/ -R, provide minimizer information in report
   -z, --report-zero-counts
           In comb. w/ -R, report taxa w/ 0 count
+      --full-output
+          output file contains all unclassified sequence
   -h, --help
           Print help (see more with '--help')
   -V, --version
diff --git a/kr2r/src/args.rs b/kr2r/src/args.rs
index 257ab7f..e5f5823 100644
--- a/kr2r/src/args.rs
+++ b/kr2r/src/args.rs
@@ -133,6 +133,7 @@ pub struct ClassifyArgs {
     #[clap(short = 'z', long, value_parser, default_value_t = false)]
     pub report_zero_counts: bool,
 
+    /// output file contains all unclassified sequence
     #[clap(long, value_parser, default_value_t = false)]
     pub full_output: bool,
 
diff --git a/kr2r/src/bin/resolve.rs b/kr2r/src/bin/resolve.rs
index 04355be..e71a421 100644
--- a/kr2r/src/bin/resolve.rs
+++ b/kr2r/src/bin/resolve.rs
@@ -153,10 +153,11 @@ pub struct Args {
     #[clap(long)]
     pub hash_dir: PathBuf,
 
-    // chunk directory
+    /// chunk directory
     #[clap(long, value_parser, required = true)]
     pub chunk_dir: PathBuf,
 
+    /// output file contains all unclassified sequence
     #[clap(long, value_parser, default_value_t = false)]
     pub full_output: bool,
     /// Confidence score threshold, default is 0.0.