diff --git a/CHANGES.md b/CHANGES.md
index 179218d4..d4746031 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,17 @@
 # Changelog
 
+### 6.3.1 (2026-05-18)
+
+- improvement: add setting to control trigger of answer type tooltip
+
+Note: Prior to this version, students could use quiz navigation (Next
+page/Previous page or Finish attempt/Return to attempt) to get feedback
+on parts of a question without using the adaptive mode's "Check"
+function and hence whitout getting a penalty for wrong answers, because
+Moodle automatically saves answers when the user switches between pages
+of a quiz. Other modes like interactive or immediate feedback are not
+affected.
+
 ### 6.3.0 (2026-04-30)
 
 - improvement: add setting to control trigger of answer type tooltip
diff --git a/version.php b/version.php
index 12c82521..b315e985 100644
--- a/version.php
+++ b/version.php
@@ -25,7 +25,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = 'qtype_formulas';
-$plugin->version = 2026043000;
+$plugin->version = 2026051800;
 
 $plugin->cron = 0;
 $plugin->requires = 2024100700;
@@ -36,6 +36,6 @@
     'filter_mathjaxloader' => 2024100700,
 ];
 $plugin->supported = [405, 502];
-$plugin->release = '6.3.0';
+$plugin->release = '6.3.1';
 
 $plugin->maturity = MATURITY_STABLE;