diff --git a/lisa/lisa-sdk/src/main/java/it/unive/lisa/util/datastructures/regex/RegularExpression.java b/lisa/lisa-sdk/src/main/java/it/unive/lisa/util/datastructures/regex/RegularExpression.java
index 32194cfc0..819de7af0 100644
--- a/lisa/lisa-sdk/src/main/java/it/unive/lisa/util/datastructures/regex/RegularExpression.java
+++ b/lisa/lisa-sdk/src/main/java/it/unive/lisa/util/datastructures/regex/RegularExpression.java
@@ -456,7 +456,7 @@ public String toString() {
 	 * Checks whether this regular expression recognize a string made just of
 	 * whitespaces.
 	 * 
-	 * @return {@true} if this regular expression recognize a string made just
+	 * @return {@code true} if this regular expression recognize a string made just
 	 *             of whitespaces, {@code false} otherwise.
 	 */
 	protected abstract boolean readsWhiteSpaceString();