diff --git a/casr/src/bin/casr-cluster.rs b/casr/src/bin/casr-cluster.rs
index f9560681..97ad3e89 100644
--- a/casr/src/bin/casr-cluster.rs
+++ b/casr/src/bin/casr-cluster.rs
@@ -62,7 +62,7 @@ fn make_clusters(
 
     // Handle bad reports
     if !badreports.is_empty() {
-        util::save_badreports(badreports, format!("{}/clerr", &outpath.display()))?;
+        util::save_reports(badreports, format!("{}/clerr", &outpath.display()))?;
     }
 
     if casreps.len() < 2 {
@@ -268,7 +268,7 @@ fn merge_dirs(input: &Path, output: &Path) -> Result<u64> {
 ///
 /// * `newpath` - path to directory with new CASR reports
 ///
-/// * `oldpath` - target directory for exiting clusters
+/// * `oldpath` - target directory for existing clusters
 ///
 /// * `jobs` - number of jobs for cluster updating process
 ///
@@ -439,7 +439,7 @@ fn update_clusters(
 ///
 /// Number of moved to old clusters CASR reports
 /// Number of removed by crashline deduplication CASR reports
-pub fn merge_clusters(
+fn merge_clusters(
     olds: HashMap<usize, Cluster>,
     news: &mut HashMap<usize, Cluster>,
     dir: &Path,
@@ -458,7 +458,7 @@ pub fn merge_clusters(
                 continue;
             }
             // Copy casreps from new to old
-            for (casrep, stacktrace, crashline) in new.reports() {
+            for (casrep, (stacktrace, crashline)) in new.reports() {
                 // Update cluster (and dedup crashline)
                 if !old.insert(
                     casrep.to_path_buf(),
diff --git a/casr/src/util.rs b/casr/src/util.rs
index cc2a84f6..eb2c0af8 100644
--- a/casr/src/util.rs
+++ b/casr/src/util.rs
@@ -537,18 +537,18 @@ pub fn save_clusters(clusters: &HashMap<usize, Cluster>, dir: &Path) -> Result<(
     Ok(())
 }
 
-/// Save invalid CASR reports to given directory
+/// Save CASR reports to given directory
 ///
 /// # Arguments
 ///
-/// * `badreports` - A vector of invalid CASR reports
+/// * `reports` - A vector of CASR reports
 ///
 /// * `dir` - out directory
-pub fn save_badreports(badreports: Vec<PathBuf>, dir: String) -> Result<()> {
+pub fn save_reports(reports: Vec<PathBuf>, dir: String) -> Result<()> {
     if !Path::new(&dir).exists() {
         fs::create_dir_all(&dir)?;
     }
-    for report in badreports {
+    for report in reports {
         fs::copy(
             &report,
             format!("{}/{}", dir, &report.file_name().unwrap().to_str().unwrap()),
diff --git a/docs/usage.md b/docs/usage.md
index 93fad32d..aa169040 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -339,6 +339,12 @@ If there are several `Inner` or `Outer` clusters for the report we choose the
 
 N.B. `Delta` strategy is a nonsensical strategy in `Inner` case
 
+Example:
+
+    $ casr-cluster -c casr/tests/casr_tests/casrep/test_clustering_small out
+    $ rm -f out/cl9/40.casrep out/cl7/20.casrep && rm -rf out/cl8 && mv out/cl9 out/cl8
+    $ casr-cluster -u casr/tests/casr_tests/casrep/test_clustering_small out
+
 ## casr-cli
 
 App provides text-based user interface to view CASR reports, prints joint statistics for
diff --git a/libcasr/src/stacktrace.rs b/libcasr/src/stacktrace.rs
index b83fdbac..119434ca 100644
--- a/libcasr/src/stacktrace.rs
+++ b/libcasr/src/stacktrace.rs
@@ -100,8 +100,8 @@ impl Cluster {
         crashlines: Vec<String>,
     ) -> Self {
         let mut unique_crashlines: HashMap<String, usize> = HashMap::new();
-        for (i, crashline) in crashlines.iter().enumerate() {
-            unique_crashlines.insert(crashline.clone(), i);
+        for (i, crashline) in crashlines.into_iter().enumerate() {
+            unique_crashlines.insert(crashline, i);
         }
         Cluster {
             number,
@@ -146,8 +146,7 @@ impl Cluster {
         self.paths.push(path);
         self.stacktraces.push(stacktrace);
         self.diam = None;
-        self.crashlines
-            .insert(crashline.to_string(), self.paths.len() - 1);
+        self.crashlines.insert(crashline, self.paths.len() - 1);
         true
     }
     /// Get cluster diameter
@@ -218,11 +217,11 @@ impl Cluster {
         stacktraces1.append(&mut stacktraces2);
         diam(&stacktraces1) < THRESHOLD
     }
-    /// Convert cluster to iterator
-    pub fn reports(&self) -> Vec<(PathBuf, Stacktrace, String)> {
-        let mut reports: Vec<(PathBuf, Stacktrace, String)> = Vec::new();
+    /// Convert cluster to vector of reports
+    pub fn reports(&self) -> Vec<ReportInfo> {
+        let mut reports: Vec<ReportInfo> = Vec::new();
         let mut crashlines = self.crashlines.clone();
-        for i in 0..self.paths.len() {
+        for (i, path) in self.paths.iter().enumerate() {
             // Get crashline for cur casrep
             let mut crashline = String::new();
             for (line, &number) in &crashlines {
@@ -234,11 +233,7 @@ impl Cluster {
             // Drop cur crashline from crashlines
             crashlines.remove(&crashline);
             // Update results
-            reports.push((
-                self.paths[i].clone(),
-                self.stacktraces[i].clone(),
-                crashline,
-            ));
+            reports.push((path.clone(), (self.stacktraces[i].clone(), crashline)));
         }
         reports
     }