diff --git a/docs/design/design-decodebin.txt b/docs/design/design-decodebin.txt
index 7ca84b6cad..31b8987df9 100644
--- a/docs/design/design-decodebin.txt
+++ b/docs/design/design-decodebin.txt
@@ -148,8 +148,8 @@ differences:
   * Multiple streams handling.
 
     The element handles queueing data on more than one stream at once. To
-  achieve such a feature it has request sink pads (sink_%d) and 'sometimes' src
-  pads (src_%d).
+  achieve such a feature it has request sink pads (sink_%u) and 'sometimes' src
+  pads (src_%u).
 
     When requesting a given sinkpad, the associated srcpad for that stream will
   be created. Ex: requesting sink_1 will generate src_1.
diff --git a/docs/design/design-encoding.txt b/docs/design/design-encoding.txt
index dda79addf6..942b734947 100644
--- a/docs/design/design-encoding.txt
+++ b/docs/design/design-encoding.txt
@@ -87,7 +87,7 @@ B. Goals
   ...
 
   vsrcpad = gst_element_get_src_pad(source, "src1");
-  vsinkpad = gst_element_get_request_pad (encbin, "video_%d");
+  vsinkpad = gst_element_get_request_pad (encbin, "video_%u");
   gst_pad_link(vsrcpad, vsinkpad);
 
   ...