diff --git a/.hgignore b/.hgignore
index 8dd55b6d..783d3a43 100644
--- a/.hgignore
+++ b/.hgignore
@@ -119,3 +119,4 @@ website/idxthreads/forkingRecoll.html
 website/idxthreads/xapDocCopyCrash.html
 website/pages/recoll-mingw.html
 website/pages/recoll-windows.html
+src/doc/user/RCL.SEARCH.SYNONYMS.html
diff --git a/src/qtgui/specialindex.ui b/src/qtgui/specialindex.ui
index 8acfeb12..a462f413 100644
--- a/src/qtgui/specialindex.ui
+++ b/src/qtgui/specialindex.ui
@@ -53,7 +53,7 @@
           </size>
          </property>
          <property name="toolTip">
-          <string>Directory to recursively index</string>
+          <string>Directory to recursively index. This must be inside the regular indexed area&lt;br&gt; as defined in the configuration file (topdirs).</string>
          </property>
         </widget>
        </item>