diff --git a/geometry/quaternions.c b/geometry/quaternions.c
index cdddbde8..5537fec7 100644
--- a/geometry/quaternions.c
+++ b/geometry/quaternions.c
@@ -1,6 +1,6 @@
 /**
  * @file
- * @brief API Functions related to 3D vector operations.
+ * @brief Functions related to 3D quaternions and Euler angles.
  * @author Krishna Vedala
  */
 
diff --git a/geometry/vectors_3d.c b/geometry/vectors_3d.c
index 8c82b5b9..17be64f1 100644
--- a/geometry/vectors_3d.c
+++ b/geometry/vectors_3d.c
@@ -1,6 +1,6 @@
 /**
  * @file
- * @brief API Functions related to 3D vector operations.
+ * @brief Functions related to 3D vector operations.
  * @author Krishna Vedala
  */