diff --git a/9-regular-expressions/14-regexp-lookahead-lookbehind/1-find-non-negative-integers/solution.md b/9-regular-expressions/14-regexp-lookahead-lookbehind/1-find-non-negative-integers/solution.md
index a824409f..ebc12689 100644
--- a/9-regular-expressions/14-regexp-lookahead-lookbehind/1-find-non-negative-integers/solution.md
+++ b/9-regular-expressions/14-regexp-lookahead-lookbehind/1-find-non-negative-integers/solution.md
@@ -1,7 +1,7 @@
 
 The regexp for an integer number is `pattern:\d+`.
 
-We can exclude negatives by prepending it with the negative lookahead: `pattern:(?<!-)\d+`.
+We can exclude negatives by prepending it with the negative lookbehind: `pattern:(?<!-)\d+`.
 
 Although, if we try it now, we may notice one more "extra" result: