diff --git a/libmscgen/mscgen_api.c b/libmscgen/mscgen_api.c
index f568ea94a13..b28d6535c12 100644
--- a/libmscgen/mscgen_api.c
+++ b/libmscgen/mscgen_api.c
@@ -1062,7 +1062,7 @@ static void arcBox(Context           *ctx,
  * \param arcIdUrl       The URL for rendering the test identifier as a hyperlink.
  *                        This maybe \a NULL if not required.
  * \param arcTextColour  Colour for the arc text, or NULL to use default.
- * \param arcTextColour  Colour for the arc text backgroun, or NULL to use default.
+ * \param arcTextColour  Colour for the arc text background, or NULL to use default.
  * \param arcType        The type of arc, used to control output semantics.
  */
 static void arcText(Context           *ctx,