diff --git a/src/env_var_descriptions.rs b/src/env_var_descriptions.rs
index e159fa7..c8b33b8 100644
--- a/src/env_var_descriptions.rs
+++ b/src/env_var_descriptions.rs
@@ -10,6 +10,7 @@ pub static ENV_VAR_DESCRIPTIONS: Map<&str, &str> = phf_map! {
     // "SURVIVE_TIMECODE_OFFSET_MS" => "",
     "LD_LIBRARY_PATH" =>
         "Colon-separated list of directories where the dynamic linker will search for shared object libraries.",
+    "XRT_DEBUG_GUI" => "Set to 1 to enable the Monado debug UI",
 };
 
 pub fn env_var_descriptions_as_paragraph() -> String {