diff --git a/doc/src/09000-todos.md b/doc/src/09000-todos.md
index 1c86156f..220b4dbd 100644
--- a/doc/src/09000-todos.md
+++ b/doc/src/09000-todos.md
@@ -72,15 +72,15 @@ Now the modules that are not yet started:
 
 ## Libraries
 
-- [ ] Ensure all libraries are implemented as extension traits rather than
-  wrapping store types
-- [ ] Rewrite logger to allow config/env-var based module white/blacklisting and
-  writing log to file
-- [ ] Rewrite libimagerror to be based on `chain-error` crate. This basically
+- [x] Rewrite libimagerror to be based on `chain-error` crate. This basically
   removes our error infrastructure, though existing traits and convenience
   functionality should be kept (for example the `MapErrInto` or the `IntoError`
   traits), as much as possible). If the switch to `chain-error` would require
   too much code to be rewritten, reconsider.
+- [ ] Ensure all libraries are implemented as extension traits rather than
+  wrapping store types
+- [ ] Rewrite logger to allow config/env-var based module white/blacklisting and
+  writing log to file
 
 ## User Interface
 
diff --git a/doc/src/09020-changelog.md b/doc/src/09020-changelog.md
index f0105f4b..13feccdf 100644
--- a/doc/src/09020-changelog.md
+++ b/doc/src/09020-changelog.md
@@ -26,6 +26,9 @@ This section contains the changelog from the last release to the next release.
       subdirectories were introduced for different types of crates
     * The documentation got a major overhaul and was partly rewritten
     * The logger is now configurable via the config file.
+    * The error handling of the whole codebase is based on the `error_chain`
+      now. `libimagerror` only contains convenience functionality, no
+      error-generating macros or such things anymore.
 * New
     * `libimagentrygps` was introduced
 * Fixed bugs