Fix spelling

3 files changed, 7 insertions, 7 deletions

diff --git a/doc/guides/compile.md b/doc/guides/compile.md
index f09050f9d..6fa8a761b 100644
--- a/doc/guides/compile.md
+++ b/doc/guides/compile.md
@@ -13,7 +13,7 @@ To compile mruby out of the source code you need the following tools:
 * Ruby 2.0 or later (e.g. `ruby` or `jruby`)
 
 Note that `bison` bundled with MacOS is too old to compile `mruby`.
-Try `brew install bison` and follow the instuction shown to update
+Try `brew install bison` and follow the instruction shown to update
 the `$PATH` to compile `mruby`. We also encourage to upgrade `ruby`
 on MacOS in similar manner.
 
@@ -29,7 +29,7 @@ inside of the mruby source root. To generate and execute the test tools call
 `rake test`. To clean all build files call `rake clean`. To see full command
 line on build, call `rake -v`.
 
-You can specify your owne configration file by the `MRUBY_CONFIG` environment
+You can specify your owne configuration file by the `MRUBY_CONFIG` environment
 variable (you can use `CONFIG` for shorthand for `MRUBY_CONFIG`). If the path
 doesn't exist, *build_config/${MRUBY_CONFIG}.rb* is used. The default
 configuration is defined in the `build_config/default.rb` file.
diff --git a/doc/guides/mrbgems.md b/doc/guides/mrbgems.md
index f05fd1f08..7120901ee 100644
--- a/doc/guides/mrbgems.md
+++ b/doc/guides/mrbgems.md
@@ -59,7 +59,7 @@ NOTE: `:bitbucket` option supports only git. Hg is unsupported in this version.
 
 There are instances when you wish to add a collection of mrbgems into mruby at
 once, or be able to substitute mrbgems based on configuration, without having to
-add each gem to your build configration file.  A packaged collection of mrbgems
+add each gem to your build configuration file.  A packaged collection of mrbgems
 is called a GemBox.  A GemBox is a file that contains a list of mrbgems to load
 into mruby, in the same format as if you were adding them to the build config
 via `config.gem`, but wrapped in an `MRuby::GemBox` object.  GemBoxes are
@@ -78,7 +78,7 @@ must be saved with a *.gembox* extension inside the *mrbgems* directory to to be
 picked up by mruby.
 
 To use this example GemBox, we save it as `custom.gembox` inside the *mrbgems*
-directory in mruby, and add the following to your build configration file inside
+directory in mruby, and add the following to your build configuration file inside
 the build block:
 ```ruby
 conf.gembox 'custom'
diff --git a/doc/mruby3.md b/doc/mruby3.md
index ae1a9b38e..75839705c 100644
--- a/doc/mruby3.md
+++ b/doc/mruby3.md
@@ -13,7 +13,7 @@ directory. For examples:
 * `boxing`: compiles all three boxing options
 * `clang-asan`: compiles with `clang`'s Address Sanitizer
 
-You can specify the build configration file with the
+You can specify the build configuration file with the
 `MRUBY_CONFIG` environment variable (or `CONFIG` in short).
 If the value specified by `MRUBY_CONFIG` is not the path to
 the configuration file, `build_config/${MRUBY_CONFIG}.rb` is
@@ -68,7 +68,7 @@ Some configuration macro names are changed for consistency (use `MRB_USE_XXX`
 ## `MRB_NO_BOXING`
 
 Uses `struct` to represent `mrb_value`. Consumes more memory
-but easier to inveticate the internal and to debug. It used
+but easier to investigate the internal and to debug. It used
 to be default `mrb_value` representation. Now the default is
 `MRB_WORD_BOXING`.
 
@@ -137,7 +137,7 @@ Instructions for old exception handling
 * `OP_EPUSH`
 * `OP_EPOP`
 
-No more operand extention
+No more operand extension
 
 * `OP_EXT1`
 * `OP_EXT2`