diff --git a/src/main/java/cz/cvut/kbss/termit/service/document/html/UnconfirmedTermOccurrenceRemover.java b/src/main/java/cz/cvut/kbss/termit/service/document/html/UnconfirmedTermOccurrenceRemover.java
index 60baf9437..1292e0d68 100644
--- a/src/main/java/cz/cvut/kbss/termit/service/document/html/UnconfirmedTermOccurrenceRemover.java
+++ b/src/main/java/cz/cvut/kbss/termit/service/document/html/UnconfirmedTermOccurrenceRemover.java
@@ -3,10 +3,13 @@
 import cz.cvut.kbss.termit.exception.FileContentProcessingException;
 import cz.cvut.kbss.termit.util.TypeAwareByteArrayResource;
 import cz.cvut.kbss.termit.util.TypeAwareResource;
+import jakarta.annotation.Nonnull;
 import org.jsoup.Jsoup;
 import org.jsoup.nodes.Document;
 import org.jsoup.nodes.Node;
 import org.jsoup.select.Elements;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.BufferedWriter;
 import java.io.ByteArrayOutputStream;
@@ -19,6 +22,7 @@
  */
 public class UnconfirmedTermOccurrenceRemover {
 
+    private static final Logger LOG = LoggerFactory.getLogger(UnconfirmedTermOccurrenceRemover.class);
 
     /**
      * Removes unconfirmed term occurrences from the specified input.
@@ -31,7 +35,8 @@ public class UnconfirmedTermOccurrenceRemover {
      * @param input Input to process
      * @return Processed content
      */
-    public TypeAwareResource removeUnconfirmedOccurrences(TypeAwareResource input) {
+    public TypeAwareResource removeUnconfirmedOccurrences(@Nonnull TypeAwareResource input) {
+        LOG.trace("Removing unconfirmed occurrences from file {}.", input.getFilename());
         try {
             final Document doc = Jsoup.parse(input.getInputStream(), StandardCharsets.UTF_8.name(), "");
             doc.outputSettings().prettyPrint(false);