diff --git a/src/main/java/org/codelibs/fess/job/GenerateThumbnailJob.java b/src/main/java/org/codelibs/fess/job/GenerateThumbnailJob.java
index 004716cac..1f85080cf 100644
--- a/src/main/java/org/codelibs/fess/job/GenerateThumbnailJob.java
+++ b/src/main/java/org/codelibs/fess/job/GenerateThumbnailJob.java
@@ -121,7 +121,7 @@ public class GenerateThumbnailJob {
         try {
             executeThumbnailGenerator();
         } catch (final Exception e) {
-            logger.error("Failed to purge user info.", e);
+            logger.error("Failed to generate thumbnails.", e);
             resultBuf.append(e.getMessage()).append("\n");
         }
 
diff --git a/src/main/java/org/codelibs/fess/job/PurgeThumbnailJob.java b/src/main/java/org/codelibs/fess/job/PurgeThumbnailJob.java
index d3a056535..50b1753c3 100644
--- a/src/main/java/org/codelibs/fess/job/PurgeThumbnailJob.java
+++ b/src/main/java/org/codelibs/fess/job/PurgeThumbnailJob.java
@@ -29,7 +29,7 @@ public class PurgeThumbnailJob {
             final long count = ComponentUtil.getThumbnailManager().purge(getExpiry());
             return "Deleted " + count + " thumbnail files.";
         } catch (final Exception e) {
-            logger.error("Failed to purge user info.", e);
+            logger.error("Failed to purge thumbnails.", e);
             return e.getMessage();
         }
     }
diff --git a/src/main/java/org/codelibs/fess/job/SuggestJob.java b/src/main/java/org/codelibs/fess/job/SuggestJob.java
index 95f0ae786..e669b73e2 100644
--- a/src/main/java/org/codelibs/fess/job/SuggestJob.java
+++ b/src/main/java/org/codelibs/fess/job/SuggestJob.java
@@ -121,7 +121,7 @@ public class SuggestJob {
         try {
             executeSuggestCreator();
         } catch (final Exception e) {
-            logger.error("Failed to purge user info.", e);
+            logger.error("Failed to create suggest data.", e);
             resultBuf.append(e.getMessage()).append("\n");
         }