diff --git a/docs/api.rst b/docs/api.rst
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -118,15 +118,15 @@
 
        :param string src: starting node specified as a SWH PID
        :param string dst: destination node, either as a node PID or a node type.
-	   The traversal will stop at the first node encountered matching the
-	   desired destination.
+           The traversal will stop at the first node encountered matching the
+           desired destination.
 
        :query string edges: edges types the traversal can follow; default to
-	   ``"*"``
+           ``"*"``
        :query string traversal: traversal algorithm; can be either ``dfs`` or
-	   ``bfs``, default to ``dfs``
+           ``bfs``, default to ``dfs``
        :query string direction: direction in which graph edges will be followed;
-	   can be either ``forward`` or ``backward``, default to ``forward``
+           can be either ``forward`` or ``backward``, default to ``forward``
 
        :statuscode 200: success
        :statuscode 400: invalid query string provided
@@ -134,15 +134,15 @@
 
        .. sourcecode:: http
 
-	   HTTP/1.1 200 OK
-	   Content-Type: text/plain
-	   Transfer-Encoding: chunked
+           HTTP/1.1 200 OK
+           Content-Type: text/plain
+           Transfer-Encoding: chunked
 
-	   swh:1:rev:f39d7d78b70e0f39facb1e4fab77ad3df5c52a35
-	   swh:1:rev:52c90f2d32bfa7d6eccd66a56c44ace1f78fbadd
-	   swh:1:rev:cea92e843e40452c08ba313abc39f59efbb4c29c
-	   swh:1:rev:8d517bdfb57154b8a11d7f1682ecc0f79abf8e02
-	   ...
+           swh:1:rev:f39d7d78b70e0f39facb1e4fab77ad3df5c52a35
+           swh:1:rev:52c90f2d32bfa7d6eccd66a56c44ace1f78fbadd
+           swh:1:rev:cea92e843e40452c08ba313abc39f59efbb4c29c
+           swh:1:rev:8d517bdfb57154b8a11d7f1682ecc0f79abf8e02
+           ...
 
 .. http:get:: /graph/randomwalk/:src/:dst