diff --git a/docs/source/elf.rst b/docs/source/elf.rst
new file mode 100644
index 0000000..04576d1
--- /dev/null
+++ b/docs/source/elf.rst
@@ -0,0 +1,14 @@
+class Elf
+====================================
+
+Used to get some constant value from the binary::
+
+    2.2.0 :001 > require 'rubypwn'
+     => true
+    2.2.0 :002 > e = Elf.new "/lib/i386-linux-gnu/libc.so.6"
+    2.2.0 :003 > e.gotplt.keys
+     => ["_Unwind_Find_FDE", "realloc", "malloc", "memalign", "_dl_find_dso_for_object", "calloc", "___tls_get_addr", "free", ""]
+    2.2.0 :004 > e.gotplt["malloc"]
+     => 1744916
+    2.2.0 :005 > puts "%08x" % e.gotplt["malloc"]
+    001aa014