diff --git a/gdk/gdktypes.h b/gdk/gdktypes.h
index 89c5e7d606..10f4aff08a 100644
--- a/gdk/gdktypes.h
+++ b/gdk/gdktypes.h
@@ -334,26 +334,26 @@ typedef enum
  * @GDK_MEMORY_A8B8G8R8: 4 bytes; for alpha, blue, green, red.
  * @GDK_MEMORY_R8G8B8: 3 bytes; for red, green, blue. The data is opaque.
  * @GDK_MEMORY_B8G8R8: 3 bytes; for blue, green, red. The data is opaque.
- * @GDK_MEMORY_R16G16B16: 3 guint16 values; for red, green, blue. Since 4.6
+ * @GDK_MEMORY_R16G16B16: 3 guint16 values; for red, green, blue. Since: 4.6
  * @GDK_MEMORY_R16G16B16A16_PREMULTIPLIED: 4 guint16 values; for red, green,
  *   blue, alpha. The color values are premultiplied with the alpha value.
- *   Since 4.6
+ *  Since: 4.6
  * @GDK_MEMORY_R16G16B16A16: 4 guint16 values; for red, green, blue, alpha.
- *   Since 4.6
+ *  Since: 4.6
  * @GDK_MEMORY_R16G16B16_FLOAT: 3 half-float values; for red, green, blue.
- *   The data is opaque. Since 4.6
+ *   The data is opaque. Since: 4.6
  * @GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED: 4 half-float values; for
  *   red, green, blue and alpha. The color values are premultiplied with
- *   the alpha value. Since 4.6
+ *   the alpha value. Since: 4.6
  * @GDK_MEMORY_R16G16B16A16_FLOAT: 4 half-float values; for red, green,
- *   blue and alpha. Since 4.6
+ *   blue and alpha. Since: 4.6
  * @GDK_MEMORY_B32G32R32_FLOAT: 3 float values; for blue, green, red.
- *   The data is opaque. Since 4.6
+ *   The data is opaque. Since: 4.6
  * @GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED: 4 float values; for
  *   red, green, blue and alpha. The color values are premultiplied with
- *   the alpha value. Since 4.6
+ *   the alpha value. Since: 4.6
  * @GDK_MEMORY_R32G32B32A32_FLOAT: 4 float values; for red, green, blue and
- *   alpha. Since 4.6
+ *   alpha. Since: 4.6
  * @GDK_MEMORY_N_FORMATS: The number of formats. This value will change as
  *   more formats get added, so do not rely on its concrete integer.
  *