diff --git a/gtk/gtktreeselection.c b/gtk/gtktreeselection.c
index cd00a755a9..ec40a1b27d 100644
--- a/gtk/gtktreeselection.c
+++ b/gtk/gtktreeselection.c
@@ -54,7 +54,7 @@
  *
  * One of the important things to remember when monitoring the selection of
  * a view is that the #GtkTreeSelection::changed signal is mostly a hint.
- * That is,it may only emit one signal when a range of rows is selected.
+ * That is, it may only emit one signal when a range of rows is selected.
  * Additionally, it may on occasion emit a #GtkTreeSelection::changed signal
  * when nothing has happened (mostly as a result of programmers calling
  * select_row on an already selected row).