Fix filename in external-files-processes.adoc
diff --git a/solr/solr-ref-guide/modules/indexing-guide/pages/external-files-processes.adoc b/solr/solr-ref-guide/modules/indexing-guide/pages/external-files-processes.adoc
index 7d4ade2..9d8ef59 100644
--- a/solr/solr-ref-guide/modules/indexing-guide/pages/external-files-processes.adoc
+++ b/solr/solr-ref-guide/modules/indexing-guide/pages/external-files-processes.adoc
@@ -52,7 +52,7 @@
=== Format of the External File
The file itself is located in Solr's index directory, which by default is `$SOLR_HOME/data`.
-The name of the file should be `external_fieldname_` or `external_fieldname_.*`.
+The name of the file should be `external_fieldname` or `external_fieldname.*`.
For the example above, then, the file could be named `external_entryRankFile` or `external_entryRankFile.txt`.
[TIP]
