diff --git a/lang/ja/pgassignment.php b/lang/ja/pgassignment.php
index aa1801e8496..26cc154a04a 100644
--- a/lang/ja/pgassignment.php
+++ b/lang/ja/pgassignment.php
@@ -15,11 +15,16 @@ $string['allthecommentsfor'] = "
 $string['anonymous'] = "Do peer grading anonymously";
 $string['assignmentawaitinggrading'] = "Assignment awaiting grading (Deadline is \$a)";
 $string['assignmenthasbeengraded'] = "課題は評価されました";
+$string['averagegrade'] = "平均評価は \$a です";
 $string['awaitingregrading'] = "Awaiting re-grading (on iteration \$a)";
-$string['beforedeadline'] = "\$a before deadline";
+$string['beforedeadline'] = "提出日まで \$a 日";
+$string['calculatefinalgrades'] = "最終評価を計算する";
+$string['calculationofthefinalgrade'] = "最終評価の計算";
 $string['checkallocation'] = "Checking allocation of submissions...";
+$string['commentsby'] = "\$a によるコメント";
 $string['deadlineforpeergradingreached'] = "Deadline for peer grading reached";
-$string['deadlineis'] = "Deadline is \$a";
+$string['deadlineis'] = "提出日は \$a です";
+$string['displayfinalgrades'] = "最終評価を表示する";
 $string['displaygradefromteacher'] = "Display Grade from Teacher";
 $string['displayofgrades'] = "When to Display Grades";
 $string['doallocation'] = "Do you want to continue with the allocation of assignments to students?";
@@ -40,6 +45,7 @@ $string['gradeddate'] = "Grade work by";
 $string['gradedon'] = "Graded on \$a";
 $string['gradethissubmission'] = "Grade this submission";
 $string['gradethiswork'] = "Grade this work";
+$string['grading'] = "評価";
 $string['gradingaccepted'] = "Grading accepted after \$a interations";
 $string['gradingacceptedon'] = "Grading accepted on";
 $string['gradingby'] = "Grading by \$a";
@@ -72,6 +78,8 @@ $string['numberofstudents'] = "Number of students enrolled on this course: \$a";
 $string['numberofsubmissions'] = "Number of assignments submitted: \$a";
 $string['peerassessmentsalreadydisabled'] = "Peer assessments already disabled";
 $string['peerassessmentsdisabled'] = "Peer assessments disabled";
+$string['peergrade'] = "相互評価";
+$string['peergrades'] = "相互評価";
 $string['phase'] = "Phase";
 $string['present'] = "Present";
 $string['regradethissubmission'] = "Reassess this submission";
@@ -109,7 +117,7 @@ $string['thegradeis'] = "評
 $string['typeofscale'] = "Type of scale";
 $string['warningonamendingelements'] = "WARNING: There are submitted assessments. <BR>Do NOT change the number
  of elements, the scale types or the element weights.";
-$string['weightingofpeer'] = "学生による評価の比重";
+$string['weightingofpeer'] = "相互評価の比重";
 $string['weightingofteacher'] = "教師による評価の比重";
 $string['workofotherstudentsbeinggraded'] = "他の \$a 人の課題があなたによって評価されました";
 $string['youhavenotbeenallocatedanyworktograde'] = "あなたは評価すべき課題を提出していません";