diff --git a/Absorption-Imaging-Class.md b/Absorption-Imaging-Class.md
index fdfce37..385c976 100644
--- a/Absorption-Imaging-Class.md
+++ b/Absorption-Imaging-Class.md
@@ -11,10 +11,10 @@ This is a class for getting data of absorption imaging form three standard image
 * **self.image_absorption** *(2D numpy array)*: similar to previous one
 * **self.detuning** *(float)*: laser beam detuning in Hz!!!
 * **self.intensity** *(float)*: laser beam intersity at atom cloud in (W/m^2)
-* **self.beam_energy** *(float)*
-* **self.atom_number**
-* **self.transition**
-* **self.camera**
+* **self.beam_energy** *(float)*: The laser beam energy shooting on the camera during exposure.
+* **self.atom_number** *(float)*: The number of atoms.
+* **self.transition** *(class)*: see the defination of absorption_imaging.\_\_init\_\_
+* **self.camera** *(class)*: see the defination of absorption_imaging.\_\_init\_\_
 
 # Functions