diff --git a/mozilla/xpfe/components/shistory/public/nsISHistory.idl b/mozilla/xpfe/components/shistory/public/nsISHistory.idl
index f6dd8854177..c67fba0df03 100644
--- a/mozilla/xpfe/components/shistory/public/nsISHistory.idl
+++ b/mozilla/xpfe/components/shistory/public/nsISHistory.idl
@@ -113,8 +113,8 @@ interface nsISHistory: nsISupports
    *                          purged from history. During purge operation,
    *                          the latest documents are maintained and older 
    *                          'numEntries' documents are removed from history.
-   * @return                  <code>NS_OK</code> Purging was successfull
-   *                          <code>NS_ERROR_FAILURE</code> numEntries is
+   * @throws                  <code>NS_SUCCESS_LOSS_OF_INSIGNIFICANT_DATA</code> Purge was vetod.
+   * @throws                  <code>NS_ERROR_FAILURE</code> numEntries is
    *                          invalid or out of bounds with the size of history.
    *                          
    */
diff --git a/mozilla/xpfe/components/shistory/src/nsSHistory.cpp b/mozilla/xpfe/components/shistory/src/nsSHistory.cpp
index dc964eafd79..0334d2bc910 100644
--- a/mozilla/xpfe/components/shistory/src/nsSHistory.cpp
+++ b/mozilla/xpfe/components/shistory/src/nsSHistory.cpp
@@ -389,7 +389,7 @@ nsSHistory::PurgeHistory(PRInt32 aEntries)
 
   if (!purgeHistory) {
     // Listener asked us not to purge
-    return NS_OK;
+    return NS_SUCCESS_LOSS_OF_INSIGNIFICANT_DATA;
   }
 
   PRInt32 cnt = 0;