diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 313f92f35de..2503ce151e0 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -392,6 +392,8 @@ define('FEATURE_GRADE_OUTCOMES', 'outcomes');
 define('FEATURE_ADVANCED_GRADING', 'grade_advanced_grading');
 /** True if module controls the grade visibility over the gradebook */
 define('FEATURE_CONTROLS_GRADE_VISIBILITY', 'controlsgradevisbility');
+/** True if module supports plagiarism plugins */
+define('FEATURE_PLAGIARISM', 'plagiarism');
 
 /** True if module has code to track whether somebody viewed it */
 define('FEATURE_COMPLETION_TRACKS_VIEWS', 'completion_tracks_views');
diff --git a/mod/assign/lib.php b/mod/assign/lib.php
index a6cdba7f1fc..b5abc843a7d 100644
--- a/mod/assign/lib.php
+++ b/mod/assign/lib.php
@@ -88,6 +88,7 @@ function assign_supports($feature) {
         case FEATURE_BACKUP_MOODLE2:          return true;
         case FEATURE_SHOW_DESCRIPTION:        return true;
         case FEATURE_ADVANCED_GRADING:        return true;
+        case FEATURE_PLAGIARISM:              return true;
 
         default: return null;
     }
diff --git a/mod/assignment/lib.php b/mod/assignment/lib.php
index 64b4b3d51b7..20e1be1e74c 100644
--- a/mod/assignment/lib.php
+++ b/mod/assignment/lib.php
@@ -3905,6 +3905,7 @@ function assignment_supports($feature) {
         case FEATURE_BACKUP_MOODLE2:          return true;
         case FEATURE_SHOW_DESCRIPTION:        return true;
         case FEATURE_ADVANCED_GRADING:        return true;
+        case FEATURE_PLAGIARISM:              return true;
 
         default: return null;
     }
diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index 921465cd795..9c4f46e3dfe 100644
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -303,6 +303,7 @@ function forum_supports($feature) {
         case FEATURE_RATE:                    return true;
         case FEATURE_BACKUP_MOODLE2:          return true;
         case FEATURE_SHOW_DESCRIPTION:        return true;
+        case FEATURE_PLAGIARISM:              return true;
 
         default: return null;
     }
diff --git a/mod/workshop/lib.php b/mod/workshop/lib.php
index aa71ce226e0..b66bd4fcf7b 100644
--- a/mod/workshop/lib.php
+++ b/mod/workshop/lib.php
@@ -53,6 +53,7 @@ function workshop_supports($feature) {
         case FEATURE_COMPLETION_TRACKS_VIEWS:
             return true;
         case FEATURE_SHOW_DESCRIPTION:  return true;
+        case FEATURE_PLAGIARISM:        return true;
         default:                        return null;
     }
 }