diff --git a/cobalt/site/README.md b/cobalt/site/README.md
index 4a17edbce192c..c9b1695ed3974 100644
--- a/cobalt/site/README.md
+++ b/cobalt/site/README.md
@@ -14,7 +14,7 @@
 3.  Run it to regenerate the site.
 
     ```shell
-    $ docker run -it --mount type=bind,source=$(pwd),target=/code docsite
+    $ docker run -it --mount type=bind,source=${COBALT_SRC},target=/code docsite
     ```
 
 4.  (Optional) To preview the changes you must commit the generated files and
diff --git a/docker/linux/linux-x64x11/requirements.in b/docker/linux/linux-x64x11/requirements.in
index 5d8c0461d5f30..e3fb94da30036 100644
--- a/docker/linux/linux-x64x11/requirements.in
+++ b/docker/linux/linux-x64x11/requirements.in
@@ -1,2 +1,8 @@
+# IMPORTANT: Remember to also update requirements.txt when updating this file:
+# $ docker run -it --mount type=bind,source=${COBALT_SRC},target=/code -w /code python:3.8 /bin/bash
+# In the container:
+# $ pip3 install pip-tools
+# $ pip-compile --allow-unsafe --generate-hashes path/to/requirements.in
+
 selenium==3.141.0
 Brotli==1.0.9
diff --git a/docker/linux/unittest/requirements.in b/docker/linux/unittest/requirements.in
index 1a3f9e257af26..c3b047c5a4c97 100644
--- a/docker/linux/unittest/requirements.in
+++ b/docker/linux/unittest/requirements.in
@@ -1,3 +1,9 @@
+# IMPORTANT: Remember to also update requirements.txt when updating this file:
+# $ docker run -it --mount type=bind,source=${COBALT_SRC},target=/code -w /code python:3.8 /bin/bash
+# In the container:
+# $ pip3 install pip-tools
+# $ pip-compile --allow-unsafe --generate-hashes path/to/requirements.in
+
 selenium==3.141.0
 Brotli==1.0.9
 junitparser==2.8.0
diff --git a/docker/precommit_hooks/requirements.in b/docker/precommit_hooks/requirements.in
index daa21ff92e3c7..8998413d3df55 100644
--- a/docker/precommit_hooks/requirements.in
+++ b/docker/precommit_hooks/requirements.in
@@ -1,3 +1,9 @@
+# IMPORTANT: Remember to also update requirements.txt when updating this file:
+# $ docker run -it --mount type=bind,source=${COBALT_SRC},target=/code -w /code python:3.8 /bin/bash
+# In the container:
+# $ pip3 install pip-tools
+# $ pip-compile --allow-unsafe --generate-hashes path/to/requirements.in
+
 pre-commit<3
 cpplint<2
 yapf<1
diff --git a/docker/pytest/requirements.in b/docker/pytest/requirements.in
index fc99e3f622307..4f5aa3435ea96 100644
--- a/docker/pytest/requirements.in
+++ b/docker/pytest/requirements.in
@@ -1,3 +1,9 @@
+# IMPORTANT: Remember to also update requirements.txt when updating this file:
+# $ docker run -it --mount type=bind,source=${COBALT_SRC},target=/code -w /code python:3.8 /bin/bash
+# In the container:
+# $ pip3 install pip-tools
+# $ pip-compile --allow-unsafe --generate-hashes path/to/requirements.in
+
 pytest>=7.2.0
 coverage<7
 requests>=2.31.0
diff --git a/docker/windows/base/build/requirements.in b/docker/windows/base/build/requirements.in
index ffe2fce498955..b2827998fcf76 100644
--- a/docker/windows/base/build/requirements.in
+++ b/docker/windows/base/build/requirements.in
@@ -1 +1,7 @@
+# IMPORTANT: Remember to also update requirements.txt when updating this file:
+# $ docker run -it --mount type=bind,source=${COBALT_SRC},target=/code -w /code python:3.8 /bin/bash
+# In the container:
+# $ pip3 install pip-tools
+# $ pip-compile --allow-unsafe --generate-hashes path/to/requirements.in
+
 six
diff --git a/precommit_hooks/requirements.in b/precommit_hooks/requirements.in
index daa21ff92e3c7..8998413d3df55 100644
--- a/precommit_hooks/requirements.in
+++ b/precommit_hooks/requirements.in
@@ -1,3 +1,9 @@
+# IMPORTANT: Remember to also update requirements.txt when updating this file:
+# $ docker run -it --mount type=bind,source=${COBALT_SRC},target=/code -w /code python:3.8 /bin/bash
+# In the container:
+# $ pip3 install pip-tools
+# $ pip-compile --allow-unsafe --generate-hashes path/to/requirements.in
+
 pre-commit<3
 cpplint<2
 yapf<1