diff --git a/cmake-examples/README.md b/cmake-examples/README.md
new file mode 100644
index 0000000..f3b27ac
--- /dev/null
+++ b/cmake-examples/README.md
@@ -0,0 +1,9 @@
+- In =org-howto=:
+  Otherwise-empty placeholder directory for sphinx-generated cmake-examples documentation
+
+- In =public_html/org-howto/cmake-examples=:
+  Sphinx-generated documentation in this directory,  copied from somewhere like =cmake-examples/.build/docs/sphinx=
+  Entry point will be =org-howto/cmake-examples/index.html=
+
+- Note that github jekyll treats directories that begin with underscore as special.
+  Suppress that behavior by creating a =.nojekyll= file in repo root.
diff --git a/xo-flatstring/README.md b/xo-flatstring/README.md
new file mode 100644
index 0000000..313b8e8
--- /dev/null
+++ b/xo-flatstring/README.md
@@ -0,0 +1,9 @@
+- In =org-howto=:
+  Otherwise-empty placeholder directory for sphinx-generated xo-flatstring documentation
+
+- In =public_html/org-howto/xo-flatstring=:
+  Sphinx-generated documentation in this directory,  copied/installed from somewhere like =xo-flatstring/.build/docs/sphinx=
+  Entry point will be =org-howto/xo-flatstring/index.html=
+
+- Note that github jekyll treats directories that begin with underscore as special.
+  Suppress that behavior by creating a =.nojekyll= file in repo root.
diff --git a/xo-ratio/README.md b/xo-ratio/README.md
new file mode 100644
index 0000000..79318d9
--- /dev/null
+++ b/xo-ratio/README.md
@@ -0,0 +1,9 @@
+- In =org-howto=:
+  Otherwise-empty placeholder directory for sphinx-generated xo-ratio documentation
+
+- In =public_html/org-howto/xo-ratio=:
+  Sphinx-generated documentation in this directory,  copied/installed from somewhere like =xo-ratio/.build/docs/sphinx=
+  Entry point will be =org-howto/xo-ratio/index.html=
+
+- Note that github jekyll treats directories that begin with underscore as special.
+  Suppress that behavior by creating a =.nojekyll= file in repo root.
diff --git a/xo-unit/README.md b/xo-unit/README.md
new file mode 100644
index 0000000..884c1b9
--- /dev/null
+++ b/xo-unit/README.md
@@ -0,0 +1,9 @@
+- In =org-howto=:
+  Otherwise-empty placeholder directory for sphinx-generated xo-unit documentation
+
+- In =public_html/org-howto/xo-unit=:
+  Sphinx-generated documentation in this directory,  copied/installed from somewhere like =xo-unit/.build/docs/sphinx=
+  Entry point will be =org-howto/xo-unit/index.html=
+
+- Note that github jekyll treats directories that begin with underscore as special.
+  Suppress that behavior by creating a =.nojekyll= file in repo root.