diff --git a/docs/gallery/plot_external_resources.py b/docs/gallery/plot_external_resources.py
index 55eb49a99..21131cc92 100644
--- a/docs/gallery/plot_external_resources.py
+++ b/docs/gallery/plot_external_resources.py
@@ -182,7 +182,7 @@ def __init__(self, **kwargs):
 # not the object_id of the genotypes table.
 
 ###############################################################################
-# Using the add_ref method without the file parametherd.
+# Using the add_ref method without the file parameter.
 # ------------------------------------------------------
 # Even though :py:class:`~hdmf.common.resources.File` is required to create/add a new reference,
 # the user can omit the file parameter if the :py:class:`~hdmf.common.resources.Object` has a file