diff --git a/userguide/android-plugin.md b/userguide/android-plugin.md
index 354b021f..bc590050 100644
--- a/userguide/android-plugin.md
+++ b/userguide/android-plugin.md
@@ -74,7 +74,8 @@ latency.
 
 The plugin's launcher environment includes `MOBILEGL_TRANSPORT=inproc` **only if** the APK was built
 with `-Pmobilegl.buildDisaggregated=ON` or `-Pmobilegl.buildDisaggregatedInproc=ON` passed explicitly
-(the CI build of `feat/disaggregated` does this). A plain `gradle :app:assemblePluginRelease`
+(or the matching `MOBILEGL_BUILD_DISAGGREGATED` / `MOBILEGL_BUILD_DISAGGREGATED_INPROC` environment
+variable set to `ON`; the CI build of `feat/disaggregated` does this). A plain `gradle :app:assemblePluginRelease`
 still builds the split layer into the library, but the launcher environment then omits the transport
 and the plugin runs monolith. Either rebuild with the property, or add
 `MOBILEGL_TRANSPORT=inproc` in the launcher's environment editor.
diff --git a/userguide/building.md b/userguide/building.md
index 2d747d6a..ac07948e 100644
--- a/userguide/building.md
+++ b/userguide/building.md
@@ -168,8 +168,8 @@ Pass with `-P<name>=<value>`. Some can also come from an environment variable.
 | `mobilegl.apkSuffix` | `MOBILEGL_APK_SUFFIX` | git short hash | Suffix in the APK file name |
 | `mobilegl.debuggableRelease` | | `false` | Make the release build debuggable |
 
-Prefer the `-P` form for `mobilegl.buildDisaggregated`: the plugin's two Gradle scripts read the
-environment fallback differently.
+A `-P` property wins over its environment variable. The plugin's Gradle scripts and the library's script
+all read the `MOBILEGL_BUILD_DISAGGREGATED` and `MOBILEGL_BUILD_DISAGGREGATED_INPROC` fallbacks.
 
 ## CMake options
 
diff --git a/userguide/troubleshooting.md b/userguide/troubleshooting.md
index 0905dec8..de86ab85 100644
--- a/userguide/troubleshooting.md
+++ b/userguide/troubleshooting.md
@@ -51,7 +51,7 @@ The renderer string does not mention Espryt or Magma.
 - `Config: MOBILEGL_TRANSPORT='unix:...' names a transport ... staying on monolith`: put the endpoint
   in `MOBILEGL_IPC_CONTROL` and set `MOBILEGL_TRANSPORT=spawn`.
 - The plugin runs monolith in the launcher although you expected `inproc`: the APK was built without
-  an explicit `-Pmobilegl.buildDisaggregated=ON`, so its launcher environment has no
+  an explicit `-Pmobilegl.buildDisaggregated=ON` (or `MOBILEGL_BUILD_DISAGGREGATED=ON` in the environment), so its launcher environment has no
   `MOBILEGL_TRANSPORT`. Rebuild, or add `MOBILEGL_TRANSPORT=inproc` in the launcher's environment
   editor.