diff --git a/Athos-Intensity-Diagnostics/Overview.md b/Athos-Intensity-Diagnostics/Overview.md
index c96a718..7e57e87 100644
--- a/Athos-Intensity-Diagnostics/Overview.md
+++ b/Athos-Intensity-Diagnostics/Overview.md
@@ -7,6 +7,13 @@ The following intensity and position diagnostics are installed in the Athos FEL
 > ### Front end
 >[SATFE10-PDIM067](Athos-Intensity-Diagnostics/SATFE10-PDIM067)
 
+## Gas cell
+
+**Purpose:** Measurement of X-ray intensity by measuring gas absorption (**P**hoton gas **CEL**)
+
+> ### Optics Furka (located in Diavolezza hutch)
+>[SATOP31-PCEL158](Athos-Intensity-Diagnostics/SATOP31-PCEL158)
+
 # Debug guide
 ```mermaid
 %%{
@@ -26,7 +33,7 @@ The following intensity and position diagnostics are installed in the Athos FEL
 flowchart TD
     C{Type of issue}
     C -->|Motion control| D[Scott Stubbs]
-    C -->|Camera issue| E[Scott Stubbs]
+    C -->|DAQ issue| E[Scott Stubbs]
     C -->|Data issue| F[Edwin Divall]
     D -->|Not available| G[Claude Pradervand]
     E -->|Not available| G[Claude Pradervand]