diff --git a/.gitignore b/.gitignore
index e2bd43e..a518c09 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,9 +13,13 @@
 # except k&r
 !k\&r/
 # except chapters
-!k\&r/**/[0-9]*/
+!k\&r/[0-9]*/
 # and excercise solutions
-!k\&r/**/[0-9]*.c
+!k\&r/*/[0-9]*.c
+!k\&r/*/[0-9]*/
+!k\&r/*/[0-9]*/*.c
+# do ignore _ prefixed files
+k\&r/**/_*
 # and header files
 !k\&r/**/*.h
 
diff --git a/k&r/04-funcs-and-prog-struct/04-find/04-find-no-overflow.c b/k&r/04-funcs-and-prog-struct/04-find/find-no-overflow.c
similarity index 100%
rename from k&r/04-funcs-and-prog-struct/04-find/04-find-no-overflow.c
rename to k&r/04-funcs-and-prog-struct/04-find/find-no-overflow.c
diff --git a/k&r/04-funcs-and-prog-struct/04-find/04-find-opt.c b/k&r/04-funcs-and-prog-struct/04-find/find-opt.c
similarity index 100%
rename from k&r/04-funcs-and-prog-struct/04-find/04-find-opt.c
rename to k&r/04-funcs-and-prog-struct/04-find/find-opt.c
diff --git a/k&r/04-funcs-and-prog-struct/04-find/04-find.c b/k&r/04-funcs-and-prog-struct/04-find/main.c
similarity index 92%
rename from k&r/04-funcs-and-prog-struct/04-find/04-find.c
rename to k&r/04-funcs-and-prog-struct/04-find/main.c
index 6b9d993..cf4bb41 100644
--- a/k&r/04-funcs-and-prog-struct/04-find/04-find.c
+++ b/k&r/04-funcs-and-prog-struct/04-find/main.c
@@ -1,7 +1,7 @@
 #include <stdio.h>
 
-/* compile with 04-find-no-overflow.c or 04-find-opt.c
- * gcc 04-find.c [04-find-no-overflow.c | 04-find-opt.c] */
+/* compile with find-no-overflow.c or find-opt.c
+ * gcc main.c [find-no-overflow.c | find-opt.c] */
 
 int find(char *pattern, char lineno_flag, char except_flag);