diff --git a/src/scripts/h5p-dictation-sentence.js b/src/scripts/h5p-dictation-sentence.js
index 96702fd..1c5d848 100644
--- a/src/scripts/h5p-dictation-sentence.js
+++ b/src/scripts/h5p-dictation-sentence.js
@@ -419,7 +419,7 @@ class Sentence {
    * Add spaces between text and punctuation.
    * @param {string} text Text to add spaces to.
    * @param {object} [options] Options.
-   * @param {boolean} [options.autosplit=true] If true, automatically split respective symbols.
+   * @param {boolean} [options.autosplit] If true, automatically split respective symbols.
    * @returns {string} [options.wordSeparator=' '] Text with spaces and symbols.
    */
   static addSpaces(text, options = {}) {
diff --git a/src/scripts/h5p-dictation-solution.js b/src/scripts/h5p-dictation-solution.js
index 52f97b1..022a800 100644
--- a/src/scripts/h5p-dictation-solution.js
+++ b/src/scripts/h5p-dictation-solution.js
@@ -4,7 +4,7 @@ import Util from '@services/util';
 class Solution {
   /**
    * @class
-   * @param {object} [params={}] Parameters.
+   * @param {object} [params] Parameters.
    */
   constructor(params = {}) {
     this.params = params;
@@ -100,7 +100,7 @@ class Solution {
    * @param {string} word.type Status about missing, typo, ...
    * @param {string} word.solution Correct spelling of the word.
    * @param {string} word.answer User input for this word.
-   * @param {boolean} [trailingGap=true] True if wrapper should have trailing gap.
+   * @param {boolean} [trailingGap] True if wrapper should have trailing gap.
    * @returns {HTMLElement} DOM for solution words.
    */
   createSolutionWordDOM(index, word, trailingGap = true) {
@@ -237,7 +237,7 @@ class Solution {
 
   /**
    * Replace symbols with a11y readably words.
-   * @param {string} [text=''] Text to make readable.
+   * @param {string} [text] Text to make readable.
    * @returns {string} Readable text.
    */
   makeReadable(text) {
diff --git a/src/scripts/h5p-dictation.js b/src/scripts/h5p-dictation.js
index 87254fe..9d43866 100644
--- a/src/scripts/h5p-dictation.js
+++ b/src/scripts/h5p-dictation.js
@@ -668,7 +668,7 @@ class Dictation extends H5P.Question {
      * This may not be completely true, because we can't sensibly compile all
      * possible answers for a sentence if we accept small mistakes.
      * @param {object[]} gapsVariations Sentences gaps.
-     * @param {boolean} [complete=false] If true, will build complete CRP.
+     * @param {boolean} [complete] If true, will build complete CRP.
      * @returns {object[]} Correct responses pattern.
      */
     this.buildxAPICRP = (gapsVariations, complete = false) => {
diff --git a/src/scripts/services/util.js b/src/scripts/services/util.js
index 973d249..b290eb9 100644
--- a/src/scripts/services/util.js
+++ b/src/scripts/services/util.js
@@ -94,7 +94,7 @@ class Util {
    * ['a', 'b', 'c'] and ['d', 'e'] become ['a d', 'a e', 'b d', 'b e', 'c d', 'c e']
    * @param {object[]} words1 First set of strings.
    * @param {object[]} words2 Second set of strings.
-   * @param {string} [delimiter=' '] Delimiter between each string.
+   * @param {string} [delimiter] Delimiter between each string.
    * @returns {object[]} Result.
    */
   static buildCombinations(words1, words2, delimiter = ' ') {