diff --git a/extensions/WEBGL_render_shared_exponent/extension.xml b/extensions/WEBGL_render_shared_exponent/extension.xml
index b27a3f001..0bff64613 100644
--- a/extensions/WEBGL_render_shared_exponent/extension.xml
+++ b/extensions/WEBGL_render_shared_exponent/extension.xml
@@ -20,7 +20,7 @@
              name="QCOM_render_shared_exponent">
       <addendum>
         Clearing or drawing to a shared exponent color buffer will generate <code>INVALID_OPERATION</code>
-        if the associated color write mask has different values for red, green, and blue channels.
+        if the associated color write mask has different values for red, green, blue, and alpha channels.
       </addendum>
     </mirrors>
 
@@ -44,5 +44,8 @@ interface WEBGL_render_shared_exponent {
     <revision date="2024/01/25">
       <change>Promoted to Community Approved.</change>
     </revision>
+    <revision date="2026/06/30">
+      <change>Adjusted color write mask validation to require the same state for all channels.</change>
+    </revision>
   </history>
 </extension>
diff --git a/sdk/tests/conformance2/extensions/webgl-render-shared-exponent.html b/sdk/tests/conformance2/extensions/webgl-render-shared-exponent.html
index 11d505fcc..f386fb315 100644
--- a/sdk/tests/conformance2/extensions/webgl-render-shared-exponent.html
+++ b/sdk/tests/conformance2/extensions/webgl-render-shared-exponent.html
@@ -159,8 +159,6 @@
     function expectError(enabled, effectiveMask, operation) {
         if (!enabled ||
             effectiveMask == 0x0 /* 0000 */ ||
-            effectiveMask == 0x8 /* 000A */ ||
-            effectiveMask == 0x7 /* RGB0 */ ||
             effectiveMask == 0xF /* RGBA */ ) {
             wtu.glErrorShouldBe(gl, gl.NO_ERROR, operation);
         } else {
@@ -210,9 +208,21 @@
                 dbiExt.colorMaskiOES(0, true, false, false, false);
                 runOps(enabled, 1); // overridden
 
-                debug("Setting compatible color mask on RGB9_E5 draw buffer")
+                debug("Setting incompatible color mask on RGB9_E5 draw buffer")
                 dbiExt.colorMaskiOES(0, true, true, true, false);
                 runOps(enabled, 7); // overridden
+
+                debug("Setting incompatible color mask on RGB9_E5 draw buffer")
+                dbiExt.colorMaskiOES(0, false, false, false, true);
+                runOps(enabled, 8); // overridden
+
+                debug("Setting compatible color mask on RGB9_E5 draw buffer")
+                dbiExt.colorMaskiOES(0, false, false, false, false);
+                runOps(enabled, 0); // overridden
+
+                debug("Setting compatible color mask on RGB9_E5 draw buffer")
+                dbiExt.colorMaskiOES(0, true, true, true, true);
+                runOps(enabled, 15); // overridden
             }
         }
     }