--- a/upmpd/upmpdutils.hxx
+++ b/upmpd/upmpdutils.hxx
@@ -19,6 +19,13 @@
 
 #include <string>
 #include <unordered_map>
+
+/** Read protocol info file. This contains the connection manager protocol info data
+ *
+ * We strip white-space from beginning/ends of lines, and allow
+ * #-started comments (on a line alone only, comments after data not allowed).
+ */
+bool read_protocolinfo(const string& fn, string& out);
 
 /**
  * Read file into string.