diff --git a/src/util.h b/src/util.h
--- a/src/util.h
+++ b/src/util.h
@@ -226,7 +226,8 @@
      */
     bool SoftSetBoolArg(const std::string &strArg, bool fValue);
 
-    // Forces a arg setting, used only in testing
+    // Forces an arg setting. Called by SoftSetArg() if the arg hasn't already
+    // been set. Also called directly in testing.
     void ForceSetArg(const std::string &strArg, const std::string &strValue);
 
     // Forces a multi arg setting, used only in testing