diff --git a/docs/miscellaneous.rst b/docs/miscellaneous.rst
index 476500676..27289daf1 100644
--- a/docs/miscellaneous.rst
+++ b/docs/miscellaneous.rst
@@ -435,7 +435,7 @@ The following is the order of precedence for operators, listed in order of evalu
 | *16*       | Comma operator                      | ``,``                                      |
 +------------+-------------------------------------+--------------------------------------------+
 
-.. index:: block, coinbase, difficulty, number, block;number, timestamp, block;timestamp, msg, data, gas, sender, value, now, gas price, origin, keccak256, ripemd160, sha256, ecrecover, addmod, mulmod, cryptography, this, super, selfdestruct, balance, send
+.. index:: block, coinbase, difficulty, number, block;number, timestamp, block;timestamp, msg, data, gas, sender, value, now, gas price, origin, assert, keccak256, ripemd160, sha256, ecrecover, addmod, mulmod, cryptography, this, super, selfdestruct, balance, send
 
 Global Variables
 ================
@@ -460,6 +460,7 @@ Global Variables
 - ``ecrecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) returns (address)``: recover address associated with the public key from elliptic curve signature, return zero on error
 - ``addmod(uint x, uint y, uint k) returns (uint)``: compute ``(x + y) % k`` where the addition is performed with arbitrary precision and does not wrap around at ``2**256``
 - ``mulmod(uint x, uint y, uint k) returns (uint)``: compute ``(x * y) % k`` where the multiplication is performed with arbitrary precision and does not wrap around at ``2**256``
+- ``assert(bool condition)``: throws if the condition is not met
 - ``this`` (current contract's type): the current contract, explicitly convertible to ``address``
 - ``super``: the contract one level higher in the inheritance hierarchy
 - ``selfdestruct(address recipient)``: destroy the current contract, sending its funds to the given address
diff --git a/docs/units-and-global-variables.rst b/docs/units-and-global-variables.rst
index dd3d4be8d..a6f6613f1 100644
--- a/docs/units-and-global-variables.rst
+++ b/docs/units-and-global-variables.rst
@@ -79,11 +79,13 @@ Block and Transaction Properties
     You can only access the hashes of the most recent 256 blocks, all other
     values will be zero.
 
-.. index:: keccak256, ripemd160, sha256, ecrecover, addmod, mulmod, cryptography, this, super, selfdestruct, balance, send
+.. index:: assert, keccak256, ripemd160, sha256, ecrecover, addmod, mulmod, cryptography, this, super, selfdestruct, balance, send
 
 Mathematical and Cryptographic Functions
 ----------------------------------------
 
+``assert(bool condition)``:
+    throws if the condition is not met.
 ``addmod(uint x, uint y, uint k) returns (uint)``:
     compute ``(x + y) % k`` where the addition is performed with arbitrary precision and does not wrap around at ``2**256``.
 ``mulmod(uint x, uint y, uint k) returns (uint)``: