diff --git a/glib/giochannel.c b/glib/giochannel.c
index 7572c47a2..e587cd2a2 100644
--- a/glib/giochannel.c
+++ b/glib/giochannel.c
@@ -105,7 +105,7 @@
  *            various functions such as g_io_channel_write_chars() to
  *            write raw bytes to the channel.  Encoding and buffering
  *            issues are dealt with at a higher level.
- * @io_seek: (optional) seeks the channel.  This is called from
+ * @io_seek: (optional): seeks the channel.  This is called from
  *           g_io_channel_seek() on channels that support it.
  * @io_close: closes the channel.  This is called from
  *            g_io_channel_close() after flushing the buffers.