diff --git a/by_json/Makefile b/by_json/Makefile
index f304f20..d1fc16d 100644
--- a/by_json/Makefile
+++ b/by_json/Makefile
@@ -1,10 +1,12 @@
-all: orgas.svg policies.svg
+DATE := $(shell date +'%Y%m%d')
+
+all: $(DATE)-orgas.svg $(DATE)-policies.svg
 
 # All .dot files are generated by gen_%.sh file (gen_orgas.sh for example)
 %.dot: gen_%.sh
 	bash "$<" "$@"
 
-%.svg: %.dot
+$(DATE)-%.svg: %.dot
 	dot -Tsvg "$<" -o "$@"
 
 clean:
diff --git a/by_json/README.md b/by_json/README.md
index c0191d0..d593134 100644
--- a/by_json/README.md
+++ b/by_json/README.md
@@ -1,6 +1,8 @@
 # Presentation
 
-*gen.sh* generates a diagram with **graphviz** with the link between organisations, libraries and users in *rero-ils* project.
+*gen_orgas.sh* generates a diagram with **graphviz** with the link between organisations, libraries and users in *rero-ils* project.
+
+*gen_policies.sh* do the same with link between organisations, libraries, circulation policies and patron\_type/item\_type couples.
 
 # Requirements
 
@@ -9,11 +11,11 @@
 
 # Usage
 
-  * Open **gen.sh** file
+  * Open **commons.sh** file
   * change **RERO\_DIR** variable to point your **rero-ils directory**
 
 ```
 make clean && make
 ```
 
-Result: **organisations.svg** file (can be open with Gimp for example).
+Result: **2 files (orgas.svg and policies.svg)** file (can be open with Gimp for example).