diff --git a/configure.ac b/configure.ac
index df48104d31..9021c8bb90 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3305,7 +3305,7 @@ fi
 
 ## ----------------------------------------------------------------------
 ## Set some variables for general configuration information to be saved
-## and installed with the libraries.
+## and installed with the libraries (used to generate libhdf5.settings).
 ##
 
 ## HDF5 version from the first line of the README.txt file.