diff --git a/course/moodleform_mod.php b/course/moodleform_mod.php
index 07387256d3a..27234fa5a17 100644
--- a/course/moodleform_mod.php
+++ b/course/moodleform_mod.php
@@ -453,7 +453,7 @@ abstract class moodleform_mod extends moodleform {
 
             $this->repeat_elements(array($group), $count, array(), 'conditiongraderepeats', 'conditiongradeadds', 2,
                                    get_string('addgrades', 'condition'), true);
-            $mform->setHelpButton('conditiongradegroup[0]', array('gradecondition', get_string('help_gradecondition', 'condition'), 'condition'));
+            $mform->addHelpButton('conditiongradegroup[0]', 'gradecondition', 'condition');
 
             // Conditions based on completion
             $completion = new completion_info($COURSE);
diff --git a/lang/en/condition.php b/lang/en/condition.php
index a9055528256..30daeeac6da 100644
--- a/lang/en/condition.php
+++ b/lang/en/condition.php
@@ -38,6 +38,25 @@ $string['configenableavailability'] = 'When enabled, this lets you set condition
 $string['enableavailability'] = 'Enable conditional availability';
 $string['grade_atleast'] = 'must be at least';
 $string['gradecondition'] = 'Grade condition';
+$string['gradecondition_help'] = 'You can specify a condition on any grade in the course: the full course grade, the grade for any activity, or a custom grade that you create manually.
+You can enter either a minimum value (≥), a maximum value (<), both, or 
+neither. The activity will only appear if the student has a value for the 
+specified grade, and if it falls within any specified number range.
+You can add more than one grade condition. All conditions must be met in order
+for the activity to appear.
+<ul>
+<li>The range numbers can be fractional (with up to five decimal places) if 
+    necessary. </li>
+<li>Be careful with the maximum value; if the maximum is 7, a student who 
+    scores exactly 7 will not see the activity. You could set it to 7.01 if
+    you really wanted to include 7.</li>
+<li>If creating several different activities that appear according to grade 
+    ranges, use the same number for the maximum of one activity, and the minimum
+    of the next. For example, you might create one activity with a maximum of 7
+    and another with a minimum of 7. The first would appear to everyone scoring
+    between 0 and 6.99999, and the second would appear to everyone scoring 7.00000
+    to 10. This guarantees that everyone with a grade will see one or other.</li>
+</ul>';
 $string['grade_upto'] = 'and less than';
 $string['help_conditiondates'] = 'available dates';
 $string['help_showavailability'] = 'display of unavailable activities';