diff --git a/doc/rst/source/gmtwhich.rst b/doc/rst/source/gmtwhich.rst
index d9e654dc224..bef8ce0816e 100644
--- a/doc/rst/source/gmtwhich.rst
+++ b/doc/rst/source/gmtwhich.rst
@@ -62,7 +62,7 @@ Optional Arguments
 .. _-G:
 
 **-G**\ [**a**\|\ **c**\|\ **l**\|\ **u**]
-    If a file argument is a downloadable file (either a complete URL, a @file for
+    If a file argument is a downloadable file (either a complete URL, an @file for
     downloading from the GMT data server, or @earth_relief_xxy or any other of the
     remote datasets at https://www.generic-mapping-tools.org/remote-datasets/)
     we will try to download the file if it is not found in your local data or cache dirs.