diff --git a/document/INSTALL_TEST.md b/document/INSTALL_TEST.md
index fbea4973871a46a54db2fb788834cf705f84978e..5806ca838941179c6f2072465f4812d55c9b033f 100644
--- a/document/INSTALL_TEST.md
+++ b/document/INSTALL_TEST.md
@@ -1,4 +1,4 @@
-# How to install the a test version of the observation app
+# How to install a test version of the observation app
 
 ## Android