diff --git a/docs/units-and-global-variables.rst b/docs/units-and-global-variables.rst
index 7a43343f9..ab957c7d5 100644
--- a/docs/units-and-global-variables.rst
+++ b/docs/units-and-global-variables.rst
@@ -100,6 +100,7 @@ Mathematical and Cryptographic Functions
     compute RIPEMD-160 hash of the (tightly packed) arguments
 ``ecrecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) returns (address)``:
     recover the address associated with the public key from elliptic curve signature or return zero on error
+    (`example usage <https://ethereum.stackexchange.com/q/1777/222>`_)
 ``revert()``:
     abort execution and revert state changes