diff -r 48e17328c155 -r f63ba40a60f4 doc/min_cost_flow.dox
--- a/doc/min_cost_flow.dox	Sun Jan 29 22:33:14 2012 +0100
+++ b/doc/min_cost_flow.dox	Mon Jan 30 23:24:14 2012 +0100
@@ -101,7 +101,7 @@
     sup(u) \quad \forall u\in V \f]
 \f[ lower(uv) \leq f(uv) \leq upper(uv) \quad \forall uv\in A \f]
 
-However if the sum of the supply values is zero, then these two problems
+However, if the sum of the supply values is zero, then these two problems
 are equivalent.
 The \ref min_cost_flow_algs "algorithms" in LEMON support the general
 form, so if you need the equality form, you have to ensure this additional