diff --git a/lib/flex_proportions.c b/lib/flex_proportions.c
index 8f25652..a71cf1b 100644
--- a/lib/flex_proportions.c
+++ b/lib/flex_proportions.c
@@ -17,7 +17,7 @@
  *
  *   \Sum_{j} p_{j} = 1,
  *
- * This formula can be straightforwardly computed by maintaing denominator
+ * This formula can be straightforwardly computed by maintaining denominator
  * (let's call it 'd') and for each event type its numerator (let's call it
  * 'n_j'). When an event of type 'j' happens, we simply need to do:
  *   n_j++; d++;