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diff --git a/docs/nspr/reference/pruptrdiff.rst b/docs/nspr/reference/pruptrdiff.rst
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+PRUptrdiff
+==========
+
+Unsigned pointer difference type.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prtypes.h>
+
+   typedef unsigned long PRUptrdiff;