add doc/*.tag to .gitignore
diff --git a/.gitignore b/.gitignore
index e3dbcac..32915aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -98,6 +98,7 @@
 doc/vty/doxygen_sqlite3.db
 doc/gsm
 doc/html.tar
+doc/*.tag
 
 src/crc*gen.c
 src/gsm/conv*gen.c