diff --git a/changes/doc27677 b/changes/doc27677
new file mode 100644
index 0000000000000000000000000000000000000000..136a69fb31aa1069db82ac295439ba6b6f0c3fe7
--- /dev/null
+++ b/changes/doc27677
@@ -0,0 +1,4 @@
+  o Documentation:
+    - Mention that we require Python to be 2.7 or newer for
+      integration tests that we ship with Tor. Resolves ticket
+      27677.
diff --git a/doc/HACKING/WritingTests.md b/doc/HACKING/WritingTests.md
index cc393494ec6f60bc26008c7ff3d936df43069dd4..05de8e0be8029ef54f00d54a93fcade1ff1f679a 100644
--- a/doc/HACKING/WritingTests.md
+++ b/doc/HACKING/WritingTests.md
@@ -7,8 +7,8 @@ keep from introducing bugs.  The major ones are:
 
    1. Unit tests written in C and shipped with the Tor distribution.
 
-   2. Integration tests written in Python and shipped with the Tor
-      distribution.
+   2. Integration tests written in Python 2 (>= 2.7) or Python 3
+      (>= 3.1) and shipped with the Tor distribution.
 
    3. Integration tests written in Python and shipped with the Stem
       library.  Some of these use the Tor controller protocol.