diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
index db076b2d801..b35aa9ba417 100644
--- a/docs/requirements-docs.txt
+++ b/docs/requirements-docs.txt
@@ -3,3 +3,11 @@ sphinx-book-theme==1.0.1
 sphinx-copybutton==0.5.2
 myst-parser==2.0.0
 sphinx-argparse
+
+# packages to install to build the documentation
+pydantic
+-f https://download.pytorch.org/whl/cpu
+torch
+py-cpuinfo
+transformers
+openai # Required by docs/source/serving/openai_compatible_server.md's vllm.entrypoints.openai.cli_args