diff --git a/pjlib/docs/doxygen.cfg b/pjlib/docs/doxygen.cfg
index 6b6a8d3..88a032d 100644
--- a/pjlib/docs/doxygen.cfg
+++ b/pjlib/docs/doxygen.cfg
@@ -23,14 +23,14 @@
 # This could be handy for archiving the generated documentation or 
 # if some version control system is used.
 
-PROJECT_NUMBER         = 
+PROJECT_NUMBER         = $(PJ_VERSION)
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) 
 # base path where the generated documentation will be put. 
 # If a relative path is entered, it will be relative to the location 
 # where doxygen was started. If left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       = docs
+OUTPUT_DIRECTORY       = docs/$(PJ_VERSION)
 
 # The OUTPUT_LANGUAGE tag is used to specify the language in which all 
 # documentation generated by doxygen is written. Doxygen will use this