diff --git a/doc/source/configure.rst b/doc/source/configure.rst
index 794132e62..09d19c351 100644
--- a/doc/source/configure.rst
+++ b/doc/source/configure.rst
@@ -48,6 +48,14 @@ If using the command line, connect to the Ray cluster as follow:
   # Connect to ray. Notice if connected to existing cluster, you don't specify resources.
   ray.init(address=<address>)
 
+.. note::
+    Ray sets the environment variable ``OMP_NUM_THREADS=1`` by default. This is done 
+    to avoid performance degradation with many workers (issue #6998). You can 
+    override this by explicitly setting ``OMP_NUM_THREADS``. ``OMP_NUM_THREADS`` is commonly
+    used in numpy, PyTorch, and Tensorflow to perform multit-threaded linear algebra.
+    In multi-worker setting, we want one thread per worker instead of many threads
+    per worker to avoid contention.
+    
 
 Logging and Debugging
 ---------------------
diff --git a/python/ray/__init__.py b/python/ray/__init__.py
index 4ae597d99..165f57e70 100644
--- a/python/ray/__init__.py
+++ b/python/ray/__init__.py
@@ -14,9 +14,9 @@ if "pickle5" in sys.modules:
                       "packaged along with Ray).")
 
 if "OMP_NUM_THREADS" not in os.environ:
-    logger.warning("[ray] Forcing OMP_NUM_THREADS=1 to avoid performance "
-                   "degradation with many workers (issue #6998). You can "
-                   "override this by explicitly setting OMP_NUM_THREADS.")
+    logger.debug("[ray] Forcing OMP_NUM_THREADS=1 to avoid performance "
+                 "degradation with many workers (issue #6998). You can "
+                 "override this by explicitly setting OMP_NUM_THREADS.")
     os.environ["OMP_NUM_THREADS"] = "1"
 
 # Add the directory containing pickle5 to the Python path so that we find the