diff --git a/docs/section5/Rule5-43.md b/docs/section5/Rule5-43.md
new file mode 100644
index 0000000000..dd905c771a
--- /dev/null
+++ b/docs/section5/Rule5-43.md
@@ -0,0 +1,38 @@
+
+# Envelope - Rule 5-43  
+
+**Mandatory Rule:** True
+**Rule ID:** 5-43  
+**Rule Description:** Automatic fenestration shading devices shall not be modeled in the Baseline.  
+**Rule Assertion:** Baseline RMD = expected value  
+**Appendix G Section:** Section G3.1-5(f) Building Envelope Modeling Requirements for the Baseline building  
+
+**Manual Check:** None  
+**Evaluation Context:** Each Building  
+**Function Call:**  
+
+
+## Applicability Check:  
+- check whether there are subsurfaces in the building.  If there are, continue to rule logic: `if len(B_RMD...subsurfaces) == 0: NOT APPLICABLE`
+- otherwise, continue to the rule logic `else: CONTINUE TO RULE LOGIC`
+
+## Rule Logic:  
+- create a list automatic_shades_modeled and initialize it as an empty list: `automatic_shades_modeled = []`
+- look at each surface: `for surface in B_RMD...surfaces:`
+    - check if the surface is an exterior surface type: `if surface.adjacent_to == "EXTERIOR":`
+        - look at each subsurface: `for sub_surface in surface.subsurfaces:`
+            - check whether the subsurface has the data element has_automatic_shades: `if sub_surface.has_automatic_shades != NULL:`
+                - if the window has automatic shades, append this sub_surface id to the list automatic_shades_modeled: `if sub_surface.has_automatic_shades: automatic_shades_modeled.append(sub_surface.id)`
+- GO TO RULE ASSERTION
+
+**Rule Assertion:**
+- Case 1: If the baseline does not have shading devices, the list automatic_shades_modeled will be empty, PASS: `if len(automatic_shades_modeled) == 0: PASS`
+- Case 2: Otherwise FAIL: `else: FAIL`
+
+
+**Notes:**
+
+
+**[Back](../_toc.md)**
+
+