diff --git a/IMPROVEMENTS.md b/IMPROVEMENTS.md
index 8a30dfd..948e5de 100644
--- a/IMPROVEMENTS.md
+++ b/IMPROVEMENTS.md
@@ -95,8 +95,14 @@ Acceptance criteria:
   they were compared against, so `usermod` ran on every start.
 - [x] Reject negative and malformed numeric values with useful messages.
 - [x] Do not pass `None` as a Seafile configuration value. Booleans are also
-  rendered as `true`/`false` rather than Python's `True`/`False`, since the
-  daemon reads that setting with its boolean accessor.
+  rendered as `true`/`false` rather than Python's `True`/`False`. This fixed
+  `DISABLE_VERIFY_CERTIFICATE`, which never worked. The daemon reads the key
+  with `seafile_session_config_get_bool`, which is
+  `g_strcmp0(value, "true") == 0`, so it accepts only the exact string
+  `"true"`. Python's `str(True)` stored the string `"True"`, which did not
+  match and was therefore read as false, leaving verification on for anyone
+  who asked to disable it. The default stored the string `"False"`, which is
+  also not `"true"` and so was correctly read as false.
 
 Acceptance criteria:
 
diff --git a/README.md b/README.md
index 69a9ace..ae9d862 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,12 @@ volumes:
  confirmation before being deleted simultaneously. Default value is _500_.
  - `DISABLE_VERIFY_CERTIFICATE` - set to _true_ to disable server's certificate
  verification. Default value is _false_. Booleans accept _true_/_false_,
- _1_/_0_, _yes_/_no_ and _on_/_off_, in any case.
+ _1_/_0_, _yes_/_no_ and _on_/_off_, in any case. Note that this setting had no
+ effect in released images up to and including 0.0.13: whatever you set the
+ variable to, the client stored the string `True`, and the Seafile daemon
+ accepts only the lowercase string `true`, so verification stayed on even when
+ the variable was set. The default was never affected, because the string
+ `False` is also not `true`.
  - `UPLOAD_LIMIT` / `DOWNLOAD_LIMIT` -  upload/download speed limit in B/s
  (bytes per second). Default values are _0_ (unlimited).