diff --git a/examples/mrbgems/mruby-YOUR-bigint/TODO-HINT.md b/examples/mrbgems/mruby-YOUR-bigint/TODO-HINT.md
index d1877f517..4926afe15 100644
--- a/examples/mrbgems/mruby-YOUR-bigint/TODO-HINT.md
+++ b/examples/mrbgems/mruby-YOUR-bigint/TODO-HINT.md
@@ -21,9 +21,9 @@ The file structure in this example is as follows:
                             May be depended on by other GEMs.
 ```
 
-Implementors of their own bigints should copy below this directory to another directory and do the following:
+Implementers of their own bigints should copy below this directory to another directory and do the following:
 
-- Rewrite `spec.author`, `spec.license`, `spec.homepage` and `spec.summary` in `<gem-dir>/mrbgem.rake` file to those of your own implementors.
+- Rewrite `spec.author`, `spec.license`, `spec.homepage` and `spec.summary` in `<gem-dir>/mrbgem.rake` file to those of your own implementers.
 - Implement the respective functions in `<gem-dir>/core/bigint.c`.
   - Define and use an object structure for `MRB_TT_BIGINT` type-tag.
     It is recommended to use `mrb_static_assert_object_size()` to ensure that the size of the object structure is within six words.
diff --git a/src/string.c b/src/string.c
index bd060a9e4..6a2ee959b 100644
--- a/src/string.c
+++ b/src/string.c
@@ -2423,7 +2423,7 @@ mrb_str_len_to_integer(mrb_state *mrb, const char *str, size_t len, mrb_int base
   return mrb_fixnum_value(0);
 }
 
-/* obslete: use RSTRING_CSTR() or mrb_string_cstr() */
+/* obsolete: use RSTRING_CSTR() or mrb_string_cstr() */
 MRB_API const char*
 mrb_string_value_cstr(mrb_state *mrb, mrb_value *ptr)
 {