diff --git a/docs/envvars.rst b/docs/envvars.rst
index b65581a16c0..57ea5aedeec 100644
--- a/docs/envvars.rst
+++ b/docs/envvars.rst
@@ -947,6 +947,18 @@ Rusticl environment variables
 
    - ``program`` dumps compilation logs to stderr
 
+.. _clc-env-var:
+
+clc environment variables
+-----------------------------
+
+.. envvar:: CLC_DEBUG
+
+   a comma-separated list of debug channels to enable.
+
+   - ``dump_spirv`` Dumps all compiled, linked and specialized SPIR-Vs
+   - ``verbose`` Enable debug logging of clc code
+
 Nine frontend environment variables
 -----------------------------------