diff --git a/usrguide/.gitignore b/usrguide/.gitignore
index 272f7a9806e3ab156a43ffd6cda5025393558ab4..2598f1f8c26ca8574b68712422b2032f85cb11c7 100644
--- a/usrguide/.gitignore
+++ b/usrguide/.gitignore
@@ -1,3 +1,3 @@
 *.pdf
 !JavaCodegenExecTutorial.pdf
-!TITAN _demo_6.6.pl0.pdf
+!TITAN_demo_6.6.pl0.pdf
diff --git a/usrguide/TITAN _demo_6.6.pl0.pdf b/usrguide/TITAN_demo_6.6.pl0.pdf
similarity index 100%
rename from usrguide/TITAN _demo_6.6.pl0.pdf
rename to usrguide/TITAN_demo_6.6.pl0.pdf