diff --git a/docs/source/safemath.rst b/docs/source/safemath.rst
index fcb21e467..c1f9cc18c 100644
--- a/docs/source/safemath.rst
+++ b/docs/source/safemath.rst
@@ -13,12 +13,12 @@ safeMul(uint a, uint b) internal returns (uint)
 
 Multiplies two unisgned integers. Asserts that dividing the product by the non-zero multiplicand results in the multiplier.
 
-safeSub(uint a, unit b) internal returns (uint)
+safeSub(uint a, uint b) internal returns (uint)
 """""""""""""""""""""""""""""""""""""""""""""""""
 
 Checks that b is not greater than a before subtracting.
 
-safeAdd(unit a, unit b) internal returns (uint)
+safeAdd(uint a, uint b) internal returns (uint)
 """""""""""""""""""""""""""""""""""""""""""""""""
 
-Checks that the result is greater than both a and b.
\ No newline at end of file
+Checks that the result is greater than both a and b.