diff --git a/docs/runtime_variables.md b/docs/runtime_variables.md
index f1ffb791fd..936af74543 100644
--- a/docs/runtime_variables.md
+++ b/docs/runtime_variables.md
@@ -2,8 +2,9 @@ OpenBLAS checks the following environment variables on startup:
 
 * `OPENBLAS_NUM_THREADS`: the number of threads to use (for non-OpenMP builds
   of OpenBLAS)
-* `OMP_NUM_THREADS`: the number of threads to use (for OpenMP builds - note
-  that setting this may also affect any other OpenMP code)
+* `OMP_NUM_THREADS`: the number of threads to use (for OpenMP builds, and as a
+  fallback for pthreads builds - note that setting this may also affect any
+  other OpenMP code)
 * `OPENBLAS_DEFAULT_NUM_THREADS`: the number of threads to use, irrespective if
   OpenBLAS was built for OpenMP or pthreads