diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3824088..1166377 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased](https://git.rustybever.be/Chewing_Bever/vieter)
 
+## Added
+
+* Very basic build system
+    * Build is triggered by separate cron container
+    * Packages build on cron container's system
+    * Packages are always rebuilt, even if they haven't changed
+    * Hardcoded planning of builds
+    * Builds are sequential
+
+## Fixed
+
+* Each package can now only have one version in the repository at once
+  (required by Pacman)
+
 ## [0.1.0](https://git.rustybever.be/Chewing_Bever/vieter/src/tag/0.1.0)
 
 ### Changed
diff --git a/src/docker/docker.v b/src/docker/docker.v
index b68a7b4..9c93986 100644
--- a/src/docker/docker.v
+++ b/src/docker/docker.v
@@ -11,7 +11,7 @@ const buf_len = 1024
 
 fn send(req &string) ?http.Response {
 	// Open a connection to the socket
-	mut s := unix.connect_stream(docker.socket) ?
+	mut s := unix.connect_stream(docker.socket) or { return error('Failed to connect to socket ${docker.socket}.') }
 
 	defer {
 		// This or is required because otherwise, the V compiler segfaults for
@@ -21,7 +21,7 @@ fn send(req &string) ?http.Response {
 	}
 
 	// Write the request to the socket
-	s.write_string(req) ?
+	s.write_string(req) or { return error('Failed to write request to socket ${docker.socket}.') }
 
 	s.wait_for_write() ?
 
@@ -30,7 +30,7 @@ fn send(req &string) ?http.Response {
 	mut res := []byte{}
 
 	for {
-		c = s.read(mut buf) or { return error('Failed to read data from socket.') }
+		c = s.read(mut buf) or { return error('Failed to read data from socket ${docker.socket}.') }
 		res << buf[..c]
 
 		if c < docker.buf_len {
@@ -38,20 +38,22 @@ fn send(req &string) ?http.Response {
 		}
 	}
 
-	// If the response isn't a chunked reply, we return early
-	parsed := http.parse_response(res.bytestr()) ?
+	// After reading the first part of the response, we parse it into an HTTP
+	// response. If it isn't chunked, we return early with the data.
+	parsed := http.parse_response(res.bytestr()) or { return error('Failed to parse HTTP response from socket ${docker.socket}.') }
 
 	if parsed.header.get(http.CommonHeader.transfer_encoding) or { '' } != 'chunked' {
 		return parsed
 	}
 
 	// We loop until we've encountered the end of the chunked response
+	// A chunked HTTP response always ends with '0\r\n\r\n'.
 	for res.len < 5 || res#[-5..] != [byte(`0`), `\r`, `\n`, `\r`, `\n`] {
 		// Wait for the server to respond
 		s.wait_for_write() ?
 
 		for {
-			c = s.read(mut buf) or { return error('Failed to read data from socket.') }
+			c = s.read(mut buf) or { return error('Failed to read data from socket ${docker.socket}.') }
 			res << buf[..c]
 
 			if c < docker.buf_len {