diff --git a/docs/source/aabb2d.rst b/docs/source/aabb2d.rst
index 26de1b8..ec6bd42 100644
--- a/docs/source/aabb2d.rst
+++ b/docs/source/aabb2d.rst
@@ -17,16 +17,22 @@ convert it before and after calling a cglm aabb2d function.
 Table of contents (click to go):
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
+Macros:
+
+1. :c:func:`glm_aabb2d_size`
+
 Functions:
 
 1. :c:func:`glm_aabb2d_copy`
+#. :c:func:`glm_aabb2d_zero`
 #. :c:func:`glm_aabb2d_transform`
 #. :c:func:`glm_aabb2d_merge`
 #. :c:func:`glm_aabb2d_crop`
 #. :c:func:`glm_aabb2d_crop_until`
 #. :c:func:`glm_aabb2d_invalidate`
 #. :c:func:`glm_aabb2d_isvalid`
-#. :c:func:`glm_aabb2d_size`
+#. :c:func:`glm_aabb2d_diag`
+#. :c:func:`glm_aabb2d_sizev`
 #. :c:func:`glm_aabb2d_radius`
 #. :c:func:`glm_aabb2d_center`
 #. :c:func:`glm_aabb2d_aabb`
@@ -45,6 +51,13 @@ Functions documentation
       | *[in]*  **aabb**  bounding box
       | *[out]* **dest**  destination
 
+.. c:function:: void  glm_aabb2d_zero(vec2 aabb[2])
+
+    | makes all members of [aabb] 0.0f (zero)
+
+    Parameters:
+      | *[in, out]*  **aabb**     bounding box
+
 .. c:function:: void  glm_aabb2d_transform(vec2 aabb[2], mat3 m, vec2 dest[2])
 
     | apply transform to Axis-Aligned Bounding Box
@@ -111,9 +124,9 @@ Functions documentation
     Returns:
       returns true if aabb is valid otherwise false
 
-.. c:function:: float  glm_aabb2d_size(vec2 aabb[2])
+.. c:function:: float  glm_aabb2d_diag(vec2 aabb[2])
 
-    | distance between of min and max
+    | distance between min and max
 
     Parameters:
       | *[in]*   **aabb**     bounding box
@@ -121,6 +134,18 @@ Functions documentation
     Returns:
       distance between min - max
 
+
+.. c:function:: void  glm_aabb2d_sizev(vec2 aabb[2], vec2 dest)
+
+    | size vector of aabb
+
+    Parameters:
+      | *[in]*   **aabb**     bounding box
+      | *[out]*  **dest**     size vector
+
+    Returns:
+      size vector of aabb max - min
+
 .. c:function:: float  glm_aabb2d_radius(vec2 aabb[2])
 
     | radius of sphere which surrounds AABB
diff --git a/include/cglm/aabb2d.h b/include/cglm/aabb2d.h
index 94a1d44..8693ac0 100644
--- a/include/cglm/aabb2d.h
+++ b/include/cglm/aabb2d.h
@@ -10,9 +10,23 @@
 
 #include "common.h"
 #include "vec2.h"
-#include "vec4.h"
 #include "util.h"
 
+/* DEPRECATED! use _diag */
+#define glm_aabb2d_size(aabb)         glm_aabb2d_diag(aabb)
+
+/*!
+ * @brief make [aabb] zero
+ *
+ * @param[in, out]  aabb
+ */
+CGLM_INLINE
+void
+glm_aabb2d_zero(vec2 aabb[2]) {
+  glm_vec2_zero(aabb[0]);
+  glm_vec2_zero(aabb[1]);
+}
+
 /*!
  * @brief copy all members of [aabb] to [dest]
  *
@@ -152,10 +166,22 @@ glm_aabb2d_isvalid(vec2 aabb[2]) {
  */
 CGLM_INLINE
 float
-glm_aabb2d_size(vec2 aabb[2]) {
+glm_aabb2d_diag(vec2 aabb[2]) {
   return glm_vec2_distance(aabb[0], aabb[1]);
 }
 
+/*!
+ * @brief size of aabb
+ *
+ * @param[in]  aabb bounding aabb
+ * @param[out]  dest size
+ */
+CGLM_INLINE
+void
+glm_aabb2d_sizev(vec2 aabb[2], vec2 dest) {
+  glm_vec2_sub(aabb[1], aabb[0], dest); 
+}
+
 /*!
  * @brief radius of sphere which surrounds AABB
  *
@@ -164,7 +190,7 @@ glm_aabb2d_size(vec2 aabb[2]) {
 CGLM_INLINE
 float
 glm_aabb2d_radius(vec2 aabb[2]) {
-  return glm_aabb2d_size(aabb) * 0.5f;
+  return glm_aabb2d_diag(aabb) * 0.5f;
 }
 
 /*!
diff --git a/include/cglm/call/aabb2d.h b/include/cglm/call/aabb2d.h
index 3cc0593..d35a36b 100644
--- a/include/cglm/call/aabb2d.h
+++ b/include/cglm/call/aabb2d.h
@@ -13,6 +13,10 @@ extern "C" {
 
 #include "../cglm.h"
 
+CGLM_EXPORT
+void
+glmc_aabb2d_zero(vec2 aabb[2]);
+
 CGLM_EXPORT
 void
 glmc_aabb2d_copy(vec2 aabb[2], vec2 dest[2]);
@@ -46,7 +50,11 @@ glmc_aabb2d_isvalid(vec2 aabb[2]);
 
 CGLM_EXPORT
 float
-glmc_aabb2d_size(vec2 aabb[2]);
+glmc_aabb2d_diag(vec2 aabb[2]);
+
+CGLM_EXPORT
+void
+glmc_aabb2d_sizev(vec2 aabb[2], vec2 dest);
 
 CGLM_EXPORT
 float
diff --git a/src/aabb2d.c b/src/aabb2d.c
index 80a3ee0..2e3a3c2 100644
--- a/src/aabb2d.c
+++ b/src/aabb2d.c
@@ -8,6 +8,15 @@
 #include "../include/cglm/cglm.h"
 #include "../include/cglm/call.h"
 
+/* DEPRECATED! use _diag */
+#define glmc_aabb2d_size(aabb)         glmc_aabb2d_diag(aabb)
+
+CGLM_EXPORT
+void
+glmc_aabb2d_zero(vec2 aabb[2]) {
+  glm_aabb2d_zero(aabb);
+}
+
 CGLM_EXPORT
 void
 glmc_aabb2d_copy(vec2 aabb[2], vec2 dest[2]) {
@@ -55,8 +64,14 @@ glmc_aabb2d_isvalid(vec2 aabb[2]) {
 
 CGLM_EXPORT
 float
-glmc_aabb2d_size(vec2 aabb[2]) {
-  return glm_aabb2d_size(aabb);
+glmc_aabb2d_diag(vec2 aabb[2]) {
+  return glm_aabb2d_diag(aabb);
+}
+
+CGLM_EXPORT
+void
+glmc_aabb2d_sizev(vec2 aabb[2], vec2 dest) {
+  glm_aabb2d_sizev(aabb, dest);
 }
 
 CGLM_EXPORT