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Change-Id: I7103241843736e1a5747253781485afa457a64d0
Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>

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diff --git a/README.md b/README.md
index 1d1a1e8..fb420dc 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,38 @@
-# agl-service-data-persistence
 
+# Database Binding
+This binding provide a database API with key/value semantics.
+The backend is currently a Berkeley DB.
+
+## Verbs
+* **insert**:
+	This verb insert a key/value pair in the database.
+	If the key already exist, the verb fails.
+	
+* **update**:
+	This verb update an existing record.
+	If the key doesn't exist, the verb fails.
+	
+* **delete**:
+	This verb remove an existing key/value pair from the database.
+	If no matching record is found, the verb fails.
+
+* **read**:
+	This verb get the value associated with the specified key.
+	If no matching record is found, the verb fails.
+
+## Arguments
+* The **read** and **delete** verbs need only a **key** to work:
+```
+{
+	"key": "mykey"
+}
+```
+
+* The **insert** and **update** verbs need a **key** and a **value** to work:
+```
+{
+	"key": "mykey",
+	"value": "my value"
+}
+```
+The **value** can be any valid json.