diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 75260b055c..ecef850095 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -19,7 +19,7 @@ Features
 
 - CMake:
 
-  - add ``openPMD::openPMD`` alias for full-source inclusion #...
+  - add ``openPMD::openPMD`` alias for full-source inclusion #277
 
 Bug Fixes
 """""""""
@@ -30,6 +30,7 @@ Other
 - docs:
 
   - improve "Install from source" section #274
+  - Spack python 3 install command #278
 
 
 0.3.0-alpha
diff --git a/README.md b/README.md
index 3f35d0c123..5f7a7d30b2 100644
--- a/README.md
+++ b/README.md
@@ -114,7 +114,7 @@ Choose *one* of the install methods below to get started:
 ### [Spack](https://spack.io)
 
 ```bash
-# optional:               +python
+# optional:               +python ^python@3:
 spack install openpmd-api
 spack load --dependencies openpmd-api
 ```
diff --git a/docs/source/install/install.rst b/docs/source/install/install.rst
index 676f2fe275..b9a1314b30 100644
--- a/docs/source/install/install.rst
+++ b/docs/source/install/install.rst
@@ -31,7 +31,7 @@ A package for openPMD-api is available on the Spack package manager.
 
 .. code-block:: bash
 
-   # optional:               +python
+   # optional:               +python ^python@3:
    spack install openpmd-api
    spack load --dependencies openpmd-api