diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index a062fbda5bad..a1168d74e4b5 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -252,7 +252,7 @@ depending on `radix`:
 
  * `0-9`
  * `a-z`
- * `a-z`
+ * `A-Z`
 
 # Panics